各种关于移民的概念以及相关资料
Types of Migration
Internal Migration: Moving to a new home within a state, country, or continent.
External Migration: Moving to a new home in a different state, country, or continent.
Emigration: Leaving one country to move to another (e.g., the Pilgrims emigrated from England).
Immigration: Moving into a new country (e.g., the Pilgrims immigrated to America).
Population Transfer: When a government forces a large group of people out of a region,usually based on ethnicity or religion. This is also known as an involuntary or forcedmigration.
Impelled Migration (also called "reluctant" or "imposed" migration): Individuals arenot forced out of their country, but leave because of unfavorable situations such as warfare,political problems, or religious persecution.