American immigration refers to the process by which individuals from other countries move to the United States to live, work, or seek refuge. This has been a significant part of U.S. history, with waves of immigrants arriving from various regions, including Europe, Asia, and Latin America. Immigration policies have evolved over time, influenced by economic needs, social changes, and political factors. The Immigration and Nationality Act of 1965 marked a major shift in U.S. immigration policy, ending quotas based on national origin. Today, immigrants contribute to the economy, culture, and diversity of the United States, playing vital roles in various sectors, from technology to agriculture.