AP World History Unit 9 Essentials

The post-Cold War era saw dramatic economic growth, poverty reduction (especially in East Asia), and the emergence of a global middle class. But globalization also increased inequality between and within nations, displaced workers in deindustrializing countries, and concentrated wealth among global elites. The 21st century's political turbulence — populism, nationalism, anti-globalization movements — reflects these tensions.

The internet and digital communication collapsed distances, enabling instant global communication, e-commerce, and social movements that cross borders. Social media empowered individuals — enabling the Arab Spring — but also enabled disinformation, surveillance, and new forms of authoritarianism. Technology is neither inherently liberating nor oppressive; its effects depend on who controls it and how it's used.

Climate change, biodiversity loss, and resource depletion are inherently global problems that cannot be solved by individual nations acting alone. Yet the international system is built around nation-state sovereignty, creating a fundamental mismatch between the scale of environmental challenges and the mechanisms available to address them. This tension is one of the defining challenges of the 21st century.

Globalization has not produced a homogeneous world. Instead, it has triggered powerful counter-reactions: religious fundamentalism, ethnic nationalism, and movements to protect local cultures and economies from global forces. The tension between integration and fragmentation — between cosmopolitanism and identity politics — defines the contemporary world and will be central to AP exam SAQs and essays on Unit 9.