Answer:
Colonialism means the control established by a powerful country over another region for its own benefit. Its main causes were:
- Geographical discoveries: the new sea routes and lands found by Columbus, Vasco da Gama and others, and advances in navigation, opened the way for Europeans to reach distant lands.
- Industrial Revolution: factories needed a steady supply of cheap raw material and large markets for finished goods; colonies provided both.
- Surplus capital: European capitalists invested their surplus capital in colonies (plantations, mines, railways) for high profits.
- Nationalism and competition: having colonies became a matter of national pride and power; European nations competed with each other to acquire them.
- Population growth: growing population in Europe needed land to settle in.
- Strategic needs: naval bases and ports were needed to protect trade routes.
- Civilising mission and religion: Europeans believed it was the ‘white man's burden’ to civilise others; Christian missionaries also spread their religion in colonies.
Because of these causes colonialism spread over Asia, Africa and America from the 15th century onwards.