This document defines imperialism as the policy of extending a nation's authority over foreign countries and acquiring colonies. It discusses the major European powers that practiced imperialism in the late 1800s, including Belgium, the Netherlands, France, Germany, and Britain. The reasons for imperialism included profiting from new markets and raw materials, investing capital, nationalism, religion, and advancing civilization. Technological advances in transportation and communication, as well as population growth, increased competition in the global market and drove European imperialism in Africa, China, and India following the Industrial Revolution.