Colonialism entails the domination of people's lives and culture, with its primary objective being the extraction of economic benefits from the colony.
Nationalism was the most powerful idea of the 1800s. Its influence stretched throughout Europe and the Americas. It shaped countries by creating new ones or breaking up old ones.
The Industrial Revolution was the transition to new manufacturing processes in Europe and the United States, in the period between 1760 to 1820 and 1840.
World History is a critical subject for UPSC aspirants as it provides a comprehensive understanding of global events that have shaped the world we live in today.