The mass mobilization of US society in response to WWII meant there was increased workplace participation by these two groups...

Women and African Americans.

Explanation:

Women were not allowed in the military at the time, and segregation in the military was still high and present. So, these groups were two of the largest forces remaining in America that could work.

a. competition with other nations.

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;