AP World History UNIT 4 REVIEW [Everything You NEED to Know!]

AP World History Unit 4 Review: Maritime Empires, 1450–1750

1. Why European Maritime Empires Expanded

European expansion was driven by technological, political, and economic developments.

Maritime Technology

• Europeans adopted tools and knowledge from other societies:
  • The magnetic compass, developed in China, helped with navigation.
  • The astrolabe, drawing on Greek and Arab knowledge, helped sailors determine latitude.
  • The lateen sail, used by Arab merchants, allowed ships to sail more effectively against the wind.
• Europeans also improved ship design. The Portuguese caravel was smaller and faster than large merchant ships, making it useful in shallow coastal waters and rivers. When equipped with cannons, ships such as caravels and carracks could help Europeans enforce control over trade.
• European sailors improved their knowledge of wind patterns in the Atlantic and Indian Oceans.

Stronger Centralized States

• European monarchs increased their power at the expense of nobles and other traditional elites.
• More centralized monarchies could direct state policy and support overseas ventures.
• European demand for Asian spices and other goods encouraged rulers to seek sea routes that would bypass land-based trading networks and their high costs.

Economic Motives: Mercantilism and Joint-Stock Companies

• Mercantilism treated global wealth—especially gold and silver—as limited. States sought a favorable balance of trade by exporting more and importing less.
• Colonies were expected to benefit their imperial powers by providing goods and serving as markets for the imperial country’s exports.
• Joint-stock companies pooled investment from private shareholders. Their limited-liability structure meant investors could lose only what they had invested.
• These companies linked state and commercial interests: states granted trading privileges or monopolies, while merchants helped extend state influence overseas.
• The Dutch East India Company (VOC), chartered by the Dutch state in 1602, became a major force in Indian Ocean trade. British and French joint-stock companies also expanded their countries’ influence.
• Competition among European states led to attacks on rival ships and trading posts.

2. Major Maritime Powers and Their Strategies

• Portugal was an early leader in maritime expansion. Under Prince Henry the Navigator, Portuguese sailors explored the African coast, initially seeking West African gold and later access to Indian Ocean trade.
  • Portugal built a trading-post empire, establishing fortified posts—often called factories—around Africa and the Indian Ocean.
  • Its strategy relied on controlling key locations and using fast, cannon-equipped ships rather than conquering large territories.
• Spain sponsored Christopher Columbus’s westward voyage in search of an Asian route. Columbus reached the Americas instead.
  • Spain established extensive colonies in the Americas, opening the Atlantic system of trade.
  • Spain also colonized the Philippines, using tribute and coerced labor to maintain control.
• France sought a northern sea route to Asia but instead established a presence in Canada and developed a profitable fur trade with Indigenous peoples. Its American holdings were relatively small and trade-focused.
• England began overseas exploration under Elizabeth I. The early colony at Roanoke failed; Jamestown, established in 1607, became a more lasting English colony.
  • England also pursued Indian Ocean trade but initially lacked the naval power to conquer Mughal India, so it established coastal trading posts. These later became a basis for expanded British control.
• The Dutch became a major European commercial power and challenged Portuguese and Spanish influence, especially in the Indian Ocean. Their strength came particularly from control of strategic trading locations and the spice trade. They also established settlements in the Americas, including New Amsterdam.

3. The Columbian Exchange

The Columbian Exchange was the transfer of diseases, plants, foods, and animals between the Eastern and Western Hemispheres. It describes environmental exchanges, not the triangular trade itself.

Disease

• Europeans brought diseases such as smallpox and measles to the Americas.
• Indigenous peoples had not developed the same immunities as populations in Afro-Eurasia, where communities had long been in contact.
• These diseases spread rapidly and killed a devastating proportion of Indigenous people. In some places, disease killed as much as 90 percent of those infected. This population catastrophe is often called the Great Dying.
• Malaria also spread through disease-carrying mosquitoes.

Plants and Foods

• Europeans brought crops such as wheat, olives, and grapes to the Americas. Crops and foods from Africa and Asia, including rice, bananas, and sugar, also spread there.
• American crops such as maize and potatoes spread to Europe, Africa, and Asia. The subtitles credit these crops with supporting healthier populations, longer lifespans, and population growth after 1700.
• Enslaved Africans also brought food crops and food traditions, including okra and rice.
• Growing demand for export crops encouraged cash-crop agriculture: growing a crop, often a single crop, primarily for sale abroad. Caribbean sugar plantations are a major example.

Animals

• Europeans introduced pigs, sheep, and cattle to the Americas.
• Horses were especially consequential: they supported agricultural work and helped Indigenous peoples of the Plains hunt buffalo more effectively.

4. Resistance to Imperial Expansion and Change

• Tokugawa Japan: Japanese rulers initially welcomed European contact in part because they wanted access to gunpowder weapons. But the spread of Christianity came to be seen as a threat to political unity. The shogunate expelled missionaries, suppressed Christianity—sometimes violently—and largely isolated Japan from European commerce, while maintaining trade with the Dutch.
• The Fronde in France: A series of rebellions beginning in 1648 arose amid increased taxation used to finance imperial expansion and growing royal absolutism. Nobles and peasants resisted, but the rebellions were defeated and royal power grew.
• Maroons in the Caribbean and Brazil: Maroon communities were formed by free Black people, many of them escaped enslaved people. In Jamaica, Queen Nanny and other maroons resisted colonial forces. A treaty in 1738 recognized their community’s freedom.

5. African States and Global Trade

European maritime expansion did not benefit only Europeans. African states could gain power by supplying goods to expanding trade networks.

• The Asante Empire in West Africa traded gold, ivory, and enslaved people to European traders. Wealth from trade helped the Asante strengthen their military and expand political control.
• The Kingdom of the Congo developed diplomatic and commercial relations with Portugal, supplying goods including gold, copper, and enslaved people. The king converted to Christianity partly to facilitate relations with Christian states. The relationship later deteriorated.

6. Changes and Continuities in Trade Networks

Indian Ocean

• Change: European states entered the Indian Ocean network and used armed ships, trading posts, and monopolies to compete for control.
• Continuity: Middle Eastern, South Asian, East Asian, and Southeast Asian merchants continued to trade there. Gujarati merchants remained influential, and their trade helped increase Mughal wealth.
• European powers never achieved complete control of the network. Overland trade routes such as the Silk Roads also remained under the influence of Asian land-based powers, including the Ming and Qing dynasties and the Ottoman Empire.
• Trade growth increased demand for labor and goods. For example, South Asian cotton and Chinese silk production expanded for export, sometimes raising producers’ incomes and living standards.

Atlantic System

• The Atlantic system was a new network connecting the Eastern and Western Hemispheres.
• Sugar became a major commodity: Caribbean plantations produced sugarcane for export.
• Silver from Spanish American mines enriched Spain and entered global trade. It was used to buy Chinese luxury goods, helping meet China’s demand for silver and supporting the commercialization of its economy.
• The Atlantic system depended heavily on coerced labor, including Indigenous labor, indentured servitude, and African slavery. Enslaved Africans eventually made up the bulk of the labor force in many American colonies.
• Silver flows and state-granted trade monopolies helped sustain the system.

7. Labor Systems in the Americas

European colonial economies relied heavily on agriculture and mining. They continued some existing labor practices and introduced new systems.

• Mita: The Spanish adapted the Inca labor draft, which required subjects to work for a set number of days on state projects. Spanish authorities used it to compel Indigenous people to work in silver mines. The colonial system differed from the Inca system because it served Spanish and private interests and often involved dangerous, deadly work.
• Chattel slavery: Enslaved people were treated as property owned by another person; in the Atlantic system, slavery was racialized and hereditary.
  • Slavery existed in earlier African, Mediterranean, and Indian Ocean trade networks, but it was not necessarily race-based, and enslaved people could be assimilated into the societies where they lived.
  • The Atlantic slave trade was much larger in scale: the subtitles estimate that more than 12.5 million Africans were sold to plantation owners in the Americas over roughly 350 years.
  • Enslavement was connected to Blackness and used to justify extreme violence and dehumanization.
• Indentured servitude: Workers signed contracts binding them to labor for a specified period, often in exchange for passage to the Americas. Many lower-class people from Britain entered this system in North America.
• Encomienda: Spanish settlers were assigned Indigenous people who were compelled to provide labor in exchange for food and protection. The system was marked by abuses.
• Hacienda: As encomienda declined, Indigenous workers were forced to labor on large estates. The key distinction emphasized in the video is that encomienda centered on control over Indigenous people, while the hacienda system centered on landownership as a means of control.

Social Effects of the African Slave Trade

• The sale of men at roughly twice the rate of women created a gender imbalance in some West African societies.
• This imbalance contributed to changes in family structures, including increased polygyny—marriage in which a man has more than one wife.
• In the Americas, cultural interaction produced Creole languages, blending European, African, and sometimes Indigenous languages.

8. Religion and Cultural Blending

• Spain and Portugal sent Catholic missionaries, including Jesuits, to their American colonies. Conversion to Christianity was one motive used to justify conquest.
• Some Indigenous people adopted Christianity publicly while continuing Indigenous religious practices privately. When colonial authorities discovered this, they could punish people violently.
• These encounters produced religious syncretism, or the blending of religious beliefs and practices.
• African religious traditions also contributed to new blended faiths. The video gives Vodun as an example of African animist beliefs blending with Christian doctrines and practices.

9. Social Hierarchies and Political Power

Responses to Religious Diversity

• Spain expelled its Jewish population after the Reconquista, and Portugal later did the same.
• The Ottoman Empire, under Mehmed II, offered refuge to displaced Jews. Some became prominent at court, and others contributed to Ottoman economic and cultural life.

New Elites and Racial Ordering

• In Spanish America, the casta system ranked people according to race and ancestry, with status linked to the amount of Spanish ancestry a person had. It imposed Spanish colonial categories on diverse Indigenous communities.
• After the Manchu-founded Qing dynasty replaced the Ming in China, the subtitles note that Manchus reserved important bureaucratic positions for people of Manchu ethnicity, limiting Han access.

Declining Influence of Established Elites

• As monarchs centralized power, traditional elites often lost influence.
• In Russia, Peter the Great weakened the power of the boyars, the aristocratic landowning class. He abolished their rank and required people seeking bureaucratic employment to serve the state directly.

Speakers and Sources Featured

• Heimler — the video’s presenter and narrator. No other speakers are featured in the subtitles.