Thursday, 16 April 2026

Although immigration has occurred throughout American history, large-scale immigration has occurred during just four peak periods: the peopling of the original colonies, westward expansion during the middle of the 19th century, and the rise of cities at the turn of the 20th century. The fourth peak period began in the 1970s and continues today.

These peak immigration periods have coincided with fundamental transformations of the American economy. The first saw the dawn of European settlement in the Americas. The second allowed the young United States to transition from a colonial to an agricultural economy. The industrial revolution gave rise to a manufacturing economy during the third peak period, propelling America’s rise to become the leading power in the world. Today’s large-scale immigration has coincided with globalization and the last stages of transformation from a manufacturing to a 21st century knowledge-based economy. As before, immigration has been prompted by economic transformation, just as it is helping the United States adapt to new economic realities.

For a nation of immigrants and immigration, the United States adjusts its immigration policies only rarely, largely because the politics surrounding immigration can be deeply divisive. As a result, immigration policy has often been increasingly disconnected from the economic and social forces that drive immigration. When changes have been made, they have generally taken years to legislate.

Today, the United States may be on the threshold of major new reforms that would address longstanding problems of illegal immigration, as well as those in the legal immigration system, which has not been updated since 1990. The impetus for comprehensive immigration reform (CIR) has returned to the congressional stage, with bipartisan groups in the House and Senate engaged in significant negotiations to craft legislation that would increase enforcement at the nation’s borders and interiors, legalize the nation’s estimated 11 million unauthorized immigrants, and provide legal avenues for employers in the United States to access future workers they need. CIR, in one form or another, has been under consideration since at least 2001, with major debates in the Senate in 2006 and 2007. After the failure of CIR legislation in the Senate in 2007, the effort to reform the nation’s immigration laws was sidelined. The results and voting patterns of the 2012 presidential election gave both political parties new reasons to revisit an immigration reform agenda.

This country profile examines key legislative events that form the history of the U.S. immigration system, the size and attributes of the immigrant population in the country, the characteristics of legal and illegal immigration streams, U.S. policies for refugees and asylum seekers, immigrant integration efforts, postrecession immigration trends, immigration enforcement, immigration policies during President Obama’s administration, and prospects for reform legislation.

Early History

In the decades prior to 1880, immigration to the United States was primarily European, driven by forces such as industrialization in Western Europe and the Irish potato famine. The expanding frontiers of the American West and the United States’ industrial revolution drew immigrants to U.S. shores. Chinese immigrants began to arrive in large numbers for the first time in the 1850s after gold was discovered in California in 1848.

Federal oversight of immigration began in 1882, when Congress passed the Immigration Act. It established the collection of a fee from each noncitizen arriving at a U.S. port to be used by the Treasury Department to regulate immigration. Arriving immigrants were screened for the first time under this act, and entry by anyone deemed a “convict, lunatic, idiot, or person unable to take care of himself or herself without becoming a public charge” was prohibited.

As the mining boom in the West began to subside, animosity toward the large populations of Chinese laborers and other foreigners surged, and so began a series of legislative measures to restrict immigration of certain racial groups, beginning with nationals of China. The Chinese Exclusion Act of 1882 was the first such law. It halted immigration of Chinese laborers for ten years, barred Chinese naturalization, and provided for the deportation of Chinese in the country illegally. In a follow-on bill, Congress passed the 1888 Scott Act and banned the return of Chinese nationals with lawful status in the United States if they departed the country. In 1892, the Geary Act extended the ten-year bar on Chinese labor immigration, and established restrictive policies toward Chinese immigrants with and without legal status.

Between 1880 and 1930, over 27 million new immigrants arrived, mainly from Italy, Germany, Eastern Europe, Russia, Britain, Canada, Ireland, and Sweden. This peak immigration period—the last large-scale immigration wave prior to the current period—also led to new restrictions.