Quelle: vgl. wikipedia 2009 /  http://en.wikipedia.org/wiki/Immigration_to_the_United_States
001 Immigration has been a major source of population growth.

002 Emigration to the United States of America forced cultural change throughout much of American history.

003 In 2006, the number of immigrants in the USA totaled 37.5 million.

004 The United States accepts more legal immigrants as permanent residents than any other country in the world.

005  “America has constantly drawn strength and spirit from wave after wave of immigrants”. (Bill Clinton 1998)