Empires expanded and conquered peoples around the world, but they often had difficulties incorporating culturally, ethnically, and religiously diverse subjects, and administrating widely dispersed territories. Agents of the European powers moved into existing trade networks around the world. In Africa and the greater Indian Ocean, nascent European empires consisted mainly of interconnected trading posts and enclaves. In the Americas, European empires moved more quickly to settlement and territorial control, responding to local demographic and commercial conditions. Moreover, the creation of European empires in the Americas quickly fostered a new Atlantic exchange network that included the transatlantic slave trade and transpacific exchange network. Around the world, empires and states of varying sizes pursued strategies of centralization, including more efficient taxation systems that placed strains on peasant producers, sometimes prompting local rebellions. Rulers used public displays of art and architecture to legitimize state power. African states shared certain characteristics with larger Eurasian empires. Changes in African and global trading patterns strengthened some West and Central African states — especially on the coast; this led to the rise of new states and contributed to the decline of states on both the coast and in the interior.
The interconnection of the Eastern and Western hemispheres made possible by transoceanic voyaging marked a key transformation of this period. Technological innovations helped to make transoceanic connections possible. Changing patterns of long-distance trade included the global circulation of some commodities and the formation of new regional markets and financial centers. Increased inter-regional and global trade networks facilitated the spread of religion and other elements of culture as well as the migration of large numbers of people. Germs carried to the Americas ravaged the indigenous peoples, while the global exchange of crops and animals altered agriculture, diets, and populations around the planet.
Although the world’s productive systems continued to be heavily centered on agricultural production throughout this period, major changes occurred in agricultural labor, the systems and locations of manufacturing, gender and social structures, and environmental processes. Adapting to the Little Ice Age, farmers increased agricultural productivity by introducing new crops and using new methods in crop-and-field rotation. Economic growth also depended on new forms of manufacturing and new commercial patterns, especially in long-distance trade. Political and economic centers within regions shifted, and merchants’ social status tended to rise in various states. Demographic growth — even in areas such as the Americas, where disease had ravaged the population — was restored by the 18th century and surged in many regions, especially with the introduction of American food crops throughout the Eastern Hemisphere. The Columbian Exchange led to new ways of humans interacting with their environments. New forms of coerced and semi-coerced labor emerged in Europe, Africa, and the Americas, and affected ethnic and racial classifications and gender roles.
Industrialization fundamentally altered the production of goods around the world. It not only changed how goods were produced and consumed, as well as what was considered a "good", but it also had far-reaching effects on the global economy, social relations, and culture. Although it is common to speak of an "Industrial Revolution" the process of industrialization was a gradual one that unfolded over the course of the 18th and 19th centuries, eventually becoming global.
Nationalism, Revolution, and Reform The eighteenth century marked the beginning of an intense period of revolution and rebellion against existing governments, and the establishment of new nation-states around the world. Enlightenment thought and the resistance of colonized peoples to imperial centers shaped this revolutionary activity. These rebellions sometimes resulted in the formation of new states and stimulated the development of new ideologies. These new ideas in turn further stimulated the revolutionary and anti-imperial tendencies of this period.
Global Conflicts and Their Consequences At the beginning of the twentieth century, a European-dominated global political order existed, which also included the United States, Russia, and Japan. Over the course of the century, peoples and states around the world challenged this order in ways that sought to redistribute power within the existing order and to restructure empires, while those peoples and states in power attempted to maintain the status quo. Other peoples and states sought to overturn the political order itself. These challenges to, and the attempts to maintain, the political order manifested themselves in an unprecedented level of conflict with high human casualties. In the context of these conflicts, many regimes in both older and newer states struggled with maintaining political stability and were challenged by internal and external factors, including ethnic and religious conflicts, secessionist movements, territorial partitions, economic dependency, and the legacies of colonialism.