Why was there war in the 1800s?

The 1800s saw numerous wars driven by various factors, including Imperialism, nationalism, and the struggle for independence. The expansion of European empires led to conflicts over territory and resources, as seen in the Napoleonic Wars and the Opium Wars. Additionally, internal strife, such as the American Civil War, arose from deep-seated social and economic divisions, particularly regarding slavery. These conflicts were often influenced by rising national identities and the desire for self-determination among various groups.