This document provides an overview of immigration to the United States throughout history. It discusses several key points:
1) Immigration has been driven by push and pull factors and has occurred in waves, with the largest sources of immigrants changing over time from Northern and Western Europe to Latin America and Asia.
2) Attitudes toward immigrants have fluctuated from acceptance to restriction based on fears around job competition and xenophobia, with discriminatory policies enacted against certain groups like the Chinese and Japanese.
3) Today, about 12% of the US population is foreign-born, primarily from Latin America, though debates continue around topics like illegal immigration, economic impacts, and the roles of women immigrants.