Nazi efforts to purify the German race gained an air of scientific respectability from possible without war, of course, and Hitler did not shrink from its implications.
Answer:
C
Explanation:
Significance- The Cotton 'Gin enabled cotton to be cleaned of seeds much faster than by hand. It also increased the need and demand for slavery as a major labor force in the South. Interchangeable parts enabled the modernization of weapons and other machine parts.
The answer is b John F. Kennedy