Migration: The movement of people from one place to another, often due to push (negative) or pull (positive) factors such as economic opportunities or conflict.
Industrial Revolution: A period in history marked by rapid industrialization and technological advancements that transformed societies from agrarian-based economies to industrial ones.
World War II: A global conflict between 1939 and 1945, involving many countries, which had profound effects on population dynamics due to displacement, migration, and loss of life.