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Immigration to the U.S.:
A Brief History

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Explore the history of immigration to the United States.


Americans have come from every corner of the globe. Take a closer look at the history of U.S. immigration and how the “four waves” of immigration influenced the nation’s demographics, politics, culture, and economic growth.


Immigration to the U.S.:
A Brief History

The United States has often been characterized as a “nation of immigrants,” and with good reason. As a country that was literally founded by immigrants and their descendants, the United States, perhaps more so than any other country in the world, has been shaped by its immigrants.


Since 1850, immigrants have comprised a notable portion of the total U.S. population—between 5 and 15 percent.¹ Although the actual rate of immigration to the United States has varied drastically over time, immigration itself has remained a consistently significant factor in U.S. history, influencing the nation’s demographics, politics, culture, and economic growth.


 statistical data relating to a population

Number of Immigrants and Their Share of the Total U.S. Population 1850-2015

Immigration chart 1.png

Immigrants as a % of the U.S. population

Total number of immigrants

U.S. Immigrant Population and Share over Time, 1850-Present

Tabulation of data from U.S. Census Bureau, 2010-2018 American Community Surveys (ACS), and 1970, 1990, and 2000 Decennial Census   |   Migration Policy Institute

The “Four Waves”
of Immigration

The history of immigration to the United States is long and convoluted, but in broad strokes it can be grouped into four major periods, or “waves”:²

  1. Colonial period

  2. Mid-1800s

  3. Turn of the 20th century

  4. Post-1965

The “Four Waves” 


Trends in Migration to the U.S.

U.S. Department of Homeland Security, Yearbook of Immigration Statistics, 2012   |   Population Reference Bureau


Sometimes these influences have been considered positive, and the country has welcomed immigrants with open arms.


At other times, immigrants have been perceived as threats that had to be kept away. But most commonly, American sentiment has encompassed a complex mixture of both these views, simultaneously regarding some immigrants as desirable and others as not.

These mixed feelings toward immigrants have been reflected through various immigration and  naturalization  policies over the decades.


Although these policies have evolved substantially since the 1700s, they have almost always favored some groups of immigrants over others.


 to acquire citizenship in an adopted country

"The Only One Barred Out," Frank Leslie’s Illustrated Newspaper, vol. 54 (April 1, 1882), p. 96.

Identifier: LC-DIG-ds-11861. Source: Library of Congress

First Wave: The Colonial Period

The first wave arrived during the colonial period in the 17th and 18th centuries, even before the United States was founded and before official immigration records were kept. Though we do not know their exact numbers, this first wave consisted largely of Protestant English-speakers from the British Isles.

These immigrants and their descendants eventually established the original Thirteen Colonies that would declare their independence from Britain in 1776 and ultimately join together to form the nascent United States.


 coming to existence;

The landing of the Pilgrims at Plymouth, MA during the first wave, December 22, 1620.

Identifier: LC-DIG-pga-09270. Source: Library of Congress


Also among this first wave were the earliest African immigrants to North America. They probably arrived in Virginia in 1619 as indentured servants, as did many European immigrants. Many Africans won their freedom after completing their work contracts.³


But not long after, slavery began to be forcibly imposed on Africans living in the colonies, and Europeans started to forcibly move slaves en masse to North America as free labor.  


(The Transatlantic slave trade was already more than a century old, but previously most African slaves had been taken to the Caribbean, Brazil, and Spanish America.⁴)

By the time the United States was founded, close to 300,000 slaves had been forcibly brought into colonial America.

 Spanish America

the parts of America once colonized by Spaniards and in which Spanish is still generally spoken. This includes most of Central and South America (except Brazil) and part of the Caribbean. 

 indentured servant

 a person under contract to work for another person for a definite period of time, usually without pay but in exchange for free passage to a new country. During the 17th century most of the white laborers in Maryland and Virginia came from England as indentured servants.

 en masse

in a group; all together

A view of the ports in colonial Boston, 1768.

Courtesy of Boston Public Library. Source: Flickr. License

The Slave Trade by Auguste Francois Biard, ca. 1833.

Wilberforce House, Hull City Museums and Art
Galleries, UK / Bridgeman Images

Second Wave: The Mid-1800s

 Following the American Revolution, immigration did not occur on a large scale again until the mid-1800s. This second wave of immigrants peaked in the 1840s and 1850s and brought hundreds of thousands of new immigrants from northern and western Europe, primarily Irish and German Catholics.

Many were fleeing starvation or political upheaval in their homelands due to the Irish Potato Famine (1845–49) and the European Revolutions of 1848. As Catholics in a largely Protestant society, many of these new arrivals initially faced significant discrimination in the United States.

Nevertheless, they became an important part of the national social and economic fabric, becoming farmers, building canals and railroads, laboring in the emerging textile mills of the Northeast, or working as craftsmen and longshoremen in the cities. 

 American Revolution

the war of 1775–83 in which the American colonists won independence from British rule

 Irish Potato Famine

a famine in Ireland caused by the failure of successive potato crops in the 1840s. Many in Ireland starved, and many emigrated. More than a million Irish came to the United States during the famine.

European Revolutions of 1848

liberal and nationalist rebellions that broke out in 1848 in several European nations, including Germany, Austria, France, Italy, and Belgium


a person employed in a port to load and unload ships

Depiction of Bridget O’Donnell and her two children during Potato Famine, 1849.

From Illustrated London News, December 22, 1849. Source: Wikimedia