The correct answer is economically prosperous.
When Hoover was sworn into the presidency on March 4, 1929, the US economy was booming. The increased amount of credit made available by banks and other institutions allowed Americans to spend money on goods they would not have been able to pay for in the early part of the 1900's. However, 6 months after he took the presidency over, the US Stock Market Crashed and helped to spark the Great Depression.
Hundreds of Indian peoples, tribes, languages, and ways of life" would be the best option from the list, since the native population of the United States was incredibly diverse.
