Which statement about the origins of the American population is true? Question 1 options:

Immigration expanded the American population before 1807, but has not significantly contributed to it since then.

The vast majority of Americans either descended from immigrants or are immigrants themselves.

Most Americans descend from people who first populated this continent about 20,000 years ago.

About 98 percent of Americans live in this country due to the waves of Irish and German people who came in the mid-1800s.