<human>:  What is the history of immigration into the US?
<bot>: Immigration to the United States has a long and complex history, beginning with the first migrations from Asia more than 15,000 years ago and continuing with the arrival of the European settlers in the 15th and 16th centuries. Wave after wave of immigrants from Europe, as well as from Central and South America, the Caribbean, Africa, and Asia, have contributed to the cultural, economic and political development of the United States. After a period of relative stagnation during the 18th and 19th centuries, immigration has increased rapidly since the 1960s, driven largely by changes in American immigration laws and the globalization of the American economy. Today, immigrants continue to play a key role in contributing to the nation’s economy and culture.