In the United States, prematurely has a greater impact on African-Americans.
There are many different ethnic backgrounds in the United States.
The Society for the Study of the Multi-Ethnic Literature of the United States was created in 1974.
'The Church of Jesus Christ of Latter-day Saints' hasn't changed American culture. The United States is made up of many ethnic and religious groups from around the world. The United States is considered a melting pot for various ethnic groups from around the world.
White American
Irish is the second largest ethnic group (after German) in the United States with just less than 1/3 of Americans claiming Irish ancestry.
The largest ethnic minority groups in the United States are African American,and Hispanic Americans.
The Census
The two largest ethnic groups in the United States are white and black African American.
Mexicans and native Hawaiians
The largest ethnic minority groups in the United States are African American,and Hispanic Americans
Some ethnic groups are Central America, Guatemala and Honduras; They are in the United States
I presume that your question means "What ethnic group was the first present in the United States?" Well, the various Amerindians/Native Americans were present in the United States thousands of years before European colonization, so it would be the Amerindians.