Developed countries like America, Europe attracts people from other nation in many decades. In 1800s people went there in search of jobs, education and land corporations.
Explanation:
Migration means movement of people from one place to another. It has two parts: Immigration and Emigration.
In immigration people enter into a new nation and increase population density over there.
In emigration people leaves their own birth place and reduces population over there.
There are two main factors which affects migration: Pull factor and Push factor.
Pull factors work parallel with immigration where it attracts people from other nation because of various opportunities like good environment, availability of education, service etc.
Push factors go with emigration where some unfavourable conditions of a particular nation compel people to leave that place like famine, scarcity of water, excessive pollution.
