Many settlers were dissenting Christian groups who came seeking religious freedom.
The earthworks constructed by Native Americans of the Poverty Point culture in northeastern Louisiana have also been designated a UNESCO World Heritage site.
In the southern Great Lakes region, the Iroquois Confederacy (Haudenosaunee) was established at some point between the twelfth and fifteenth centuries.
Sweeping civil rights legislation, notably the Civil Rights Act of 1964, the Voting Rights Act of 1965 and the Fair Housing Act of 1968, outlawed discrimination based on race or color. The end of the Cold War and the collapse of the Soviet Union in 1991 left the United States as the world's sole superpower.
During the Cold War, the United States and the Soviet Union competed in the Space Race, culminating with the 1969 U. The United States is the world's oldest surviving federation.
In the early days of colonization, many European settlers were subject to food shortages, disease, and attacks from Native Americans.
Native Americans were also often at war with neighboring tribes and allied with Europeans in their colonial wars.
The United States is a highly developed country, with the world's largest economy by nominal GDP and second-largest economy by PPP, accounting for approximately a quarter of global GDP. The phrase "United States" was originally plural, a description of a collection of independent states—e.g., "the United States are"—including in the Thirteenth Amendment to the United States Constitution, ratified in 1865.
Despite income and wealth disparities, the United States continues to rank very high in measures of socioeconomic performance, including average wage, median income (both before and after taxes and transfers), human development, per capita GDP, and worker productivity. The singular form—e.g., "the United States is"—became popular after the end of the American Civil War. In English, the word "American" rarely refers to topics or subjects not directly connected with the United States.
A number of surviving Norse sagas provide information regarding The Maritimes and its indigenous people.