Americans are the citizens and nationals of the United States of America. The United States is home to people of many racial and ethnic origins; consequently, American law does not equate nationality with race or ethnicity but with citizenship. The U.S. has 37 ancestry groups with more than one million individuals. White Americans with ancestry from Europe, the Middle East, or North Africa form the largest racial and ethnic group at 61.6% of the U.S. population. Hispanic and Latino Americans form the second-largest group and are 18.7% of the American population. Black Americans constitute the country's third-largest ancestry group and are 12.4% of the total U.S. population. Asian Americans are the country's fourth-largest group, composing 6% of the American population. The country's 3.7 million Native Americans account for about 1.1%, and some 574 native tribes are recognized by the federal government. In addition to the U.S., people of American descent can be found internationally. As many as seven million Americans are estimated to be living abroad, and make up the American diaspora.