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.

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