The document discusses the history of immigration to America. It describes how immigration increased from 1820 to 1920 as immigrants arrived mostly from Northern and Western Europe. It then discusses some of the restrictions put on immigration, such as the Chinese Exclusion Act of 1882. The document outlines the major immigration processing centers of Castle Garden and Ellis Island. It notes how wars in other countries led to rises in immigration to America in the early 1900s. In the modern era, it explains some of the processes for becoming a legal resident or citizen of the United States.