9.9 Continuity and Change in a Globalized World

AP World 9.9 Continuity and Change Summary

This topic focuses on how to weigh how much science and technology actually changed the world from 1900 to today, and how much stayed the same. Big advances in communication, transportation, energy, agriculture, and medicine reshaped daily life, but older patterns like religion, social hierarchy, and economic inequality persisted alongside that change. This is a continuity and change over time topic, so your job is to evaluate the extent of change, not just list new inventions.

Why This Matters for the AP World History Exam

This topic closes out the course by asking you to think like a historian about the whole modern era. The core skill here is continuity and change over time, which means you need to argue how much something changed while also recognizing what stayed constant.

That skill shows up across the AP World History exam. On multiple-choice questions, you may read a source about new technology or a global movement and decide whether it shows change, continuity, or both. On the free-response side, continuity and change over time prompts reward students who can do more than list facts. Strong responses make a clear claim about the degree of change, back it with specific evidence, and acknowledge what persisted. Because Unit 9 is recent history, you can also use it to compare modern globalization with earlier networks of exchange from Units 2, 4, and 6.

Key Takeaways

• Rapid advances in science and technology changed communication, transportation, industry, agriculture, and medicine across the 20th and 21st centuries.
• New communication tools (radio, cellular, the internet) and transportation methods (air travel, shipping containers) reduced the problem of geographic distance.
• Energy technologies like petroleum and nuclear power raised productivity, while the Green Revolution and commercial agriculture boosted food output for a growing population.
• Medical innovations such as vaccines and antibiotics, plus more effective birth control, helped people live longer and gave women greater control over fertility.
• Rights-based movements challenged old assumptions about race, class, gender, and religion, and access to education and political roles became more inclusive in many places.
• Even with all this change, continuities like religious tradition, social hierarchy, and economic inequality persisted, so the strongest analysis weighs both sides.

Continuities in a Globalized Era

Despite revolutions in transportation, communication, and science, many features of global society stayed the same. These continuities show that tradition, religion, and social structure endured even during fast change.

Cultural Continuities

Many cultural traditions and belief systems held firm across the century.

• Major world religions such as Christianity, Islam, Hinduism, Buddhism, and Judaism continued to guide moral behavior, community life, and daily rituals even as some regions adopted secular governance.
• Cultural festivals like Diwali, Eid al-Fitr, Hanukkah, and Lunar New Year remained markers of ethnic and religious identity, often passed down through practice rather than formal institutions.
• Indigenous groups in places like the Amazon, the Pacific Islands, and the Arctic preserved oral histories, traditional medicine, and ecological knowledge despite pressure from outside governments, missionaries, or corporations.

These are useful examples of continuity, not a required list. The exam cares that you can show persistence over time, so pick evidence you can explain clearly.

Social Hierarchies and Structures

Globalization promised mobility, but entrenched systems of caste, class, and race often remained.

• In India, caste hierarchy persisted in many areas despite legal reforms, especially in rural regions.

• In capitalist economies, class divisions persisted as wealth was often inherited. Middle classes expanded in some regions, but concentrated wealth reinforced global economic inequality.
• In many societies, women remained excluded from top political or religious leadership even after gaining the vote and entering the workforce.

Transformative Change After 1900

The modern era reshaped how humans lived, thought, and organized themselves. From nuclear energy to social media, globalization touched nearly every part of life.

Communication and Connectivity

Technological progress shrank the distance between people and continents.

• Radio and satellite broadcasting enabled information sharing across the globe.
• The internet, spreading widely from the 1990s on, transformed communication and access to information, and social media supported activism and instant cultural diffusion.
• Cellular networks and smartphones gave users in wealthy and developing regions mobile access to information.

Medical Advancements

Scientific breakthroughs raised life expectancy and quality of life.

• Vaccines and antibiotics helped control diseases like smallpox, polio, and tuberculosis.
• Medical technologies such as imaging, organ transplants, and new surgical methods reshaped healthcare.
• More effective birth control gave women greater control over fertility and contributed to declining fertility rates in much of the world.

Agriculture and the Green Revolution

The Green Revolution began in the mid-20th century and used new technology to fight hunger.

• It spread genetically and chemically modified forms of agriculture.
• It expanded the use of chemical fertilizers, pesticides, and irrigation.

These changes greatly increased crop yields in countries like India and Mexico, but as an example of the trade-offs, they also raised concerns about environmental damage and farmer dependence on large agribusiness.

Energy and Productivity

• Petroleum became the foundation of industry and transportation, and oil-exporting states gained geopolitical leverage.
• Nuclear power provided high-output electricity, though accidents like Chernobyl in 1986 revealed environmental risks. Use this as an example of the costs that came with new energy technology.

Global Economic Shifts

By the late 20th century, many governments encouraged free-market policies and economic liberalization, a trend accelerated by the end of the Cold War. Industrial production and manufacturing increasingly shifted to Asia and Latin America, while some regions developed knowledge economies built on information technology.

• Export-oriented growth helped economies like Japan, South Korea, Taiwan, and China expand rapidly.
• China's reforms under Deng Xiaoping opened the country to private business and global investment. Reagan in the United States and Thatcher in Britain are other examples of leaders who pushed free-market policies.

Social and Political Movements

Rights-based movements challenged old assumptions about race, class, gender, and religion, and access to education and political roles became more inclusive in many places.

• Nonviolent resistance, including movements associated with figures like Gandhi, inspired struggles for independence and equality worldwide.
• The U.S. civil rights struggle and the end of apartheid in South Africa challenged state-backed segregation and racism.
• Global feminist movements pushed for legal equality, reproductive rights, and protection from violence. Female literacy and participation in higher education and professional roles rose in much of the world.
• Environmental movements grew in response to pollution and ecological damage. As examples, organizations like Greenpeace and the Green Belt Movement in Kenya mobilized people around environmental protection.

Culture and the Arts

As globalization deepened, cultural styles and products mixed across borders.

• Music, film, and television increasingly reflected a globalized society, with forms like hip-hop, K-pop, Bollywood, and Hollywood reaching international audiences.
• Consumer culture became global and crossed national borders, with brands and online commerce platforms operating worldwide.
• Shared events like the Olympics and the FIFA World Cup built international competition and connection.

How to Use This on the AP World History Exam

Free Response

Continuity and change over time prompts want a clear argument about degree. Do not just list inventions. Make a claim like "Science and technology transformed daily life through communication and medicine, yet social hierarchies and religious traditions largely persisted," then prove both halves with specific evidence.

• Lead with a thesis that takes a position on how much changed.
• Support change with concrete examples (the internet, vaccines, the Green Revolution, free-market reforms).
• Support continuity with concrete examples (persistent religious practice, caste and class hierarchy, ongoing economic inequality).
• Use specific dates, places, and people so your evidence is not vague.

MCQ

You will often get a source (a chart, quote, or image) and need to identify whether it shows change, continuity, or both.

• Watch for sources about new technology, global trade, or rights movements.
• Connect what you read to a broader Unit 9 trend rather than just the single detail.
• Distinguish a genuine break from the past from something that only looks new but continues an older pattern.

Common Trap

When a prompt asks about the extent of change, answers that only describe change (and ignore continuity) cap your analysis. Always address both sides, even briefly, to show you understand that the modern world is a mix of transformation and persistence.

Common Misconceptions

• Globalization did not erase tradition. Religion, festivals, and local identities persisted and sometimes grew stronger alongside global culture.
• New technology did not benefit everyone equally. Access to the internet, medicine, and economic opportunity varied widely by region and class.
• The Green Revolution increased food production, but it was not purely positive. It raised concerns about environmental damage and dependence on large agribusiness, so treat those outcomes as trade-offs, not required AP facts.
• Free-market reforms spreading in the late 20th century did not happen everywhere at once or in the same way. The leaders and countries named here are examples of a broad trend, not a fixed checklist.
• "Continuity and change" does not mean change always wins. A strong response weighs how much actually changed against what stayed the same, rather than assuming the modern world replaced everything old.

Related AP World History Guides

• 9.1 Advances in Technology and Exchange after 1900
• Unit 9 Overview: Globalization
• 9.2 Technological Advances and Limitations after 1900: Disease
• 9.4 Economics in the Global Age
• 9.3 Technological Advances: Debates about the Environment after 1900
• 9.5 Calls for Reform and Responses after 1900