In response to japans aggressive actions in the pacific in the 1930's the united

the answer is B. imposed an embargo on shipping war goods and petroleum products to Japan.

yellow fever and other tropical diseases

so they can differentiate themselves from others as they saw themselves as the superior race. the star was basically a symbol that meant you are a less of a person than i am because of my race. the star was also degrading for those who had to wear it because they were aware of this and the nazis used the notion to make them feel less like a person.