The British military forced them to become refugees.
Disastrous economic conditions, exacerbated by British government policies, pushed them out of the country.
Poor environmental conditions, including volcanic eruptions and tsunamis, induced them to migrate.
They were attracted by the separation of church and state (freedom of religion) in the United States.
Spanish invasions threatened their homes
Decreased economic opportunities at the same time that European countries experienced rapid population growth.
Decreased political stability as European countries were wracked by revolutions.
Religious freedom in the United States, as European countries forbade their citizens to attend most kinds of religious services.
The great reputation of schools and hospitals in the United States.
Discoveries of gold in California and Alaska in the 1800s
Arrival of Europeans and their wars with Native Americans beginning in the 1600s.
Unauthorized immigration from Latin America, especially in the 1900s.
Immigration of Asians beginning in the early twentieth century, despite the Chinese Exclusion Acts.
Opening up of the western territories to settlement.
Industrial development in the northeast, particularly at the outset of the Industrial Revolution.
From Asia to Europe
From Africa to Europe
From Asia to North America
Between and among Asian countries
From Latin America to North America
Rural to urban
Urban to suburban
Metropolitan to nonmetropolitan
Net emigration from the northeast
All of the above
Making Rio de Janeiro and Sao Paulo more attractive.
Dictating optimal locations for factories
Clearing the rain forest for agricultural activities in the interior.
Moving the capital to Brasilia.
Industrial development on the Atlantic coast.
North to south
Region to region
Urban to rural
City to city
Rural to urban.
Moving from an urban core to suburban areas
Due to expanding suburbs
Migration to rural areas and small towns from central cities or suburbs
The trend of the elderly retiring to communities in southern states such as Arizona or Florida
The decline of the inner-city infrastructure