Since 1960, the immigrant population in the united states has
gotten much smaller.
virtually disappeared.
become less diverse.
become more diverse.

(D) become more diverse.

Explanation:

The country's foreign population expanded sharply somewhere in the range of 1970 and 2000, yet its pace of development has since eased back, as indicated by a Pew Research Center investigation of U.S. Statistics Bureau information.

A sensational move in the beginnings of U.S. settlers has happened since the section of the National and Immigration Act of 1965, which wiped out national starting point shares and made room for movement from non-European nations. In 1960, 84% of the country's settlers were from Europe or Canada