54. upon what ancient civilization is the united states government modeled?
a. mali
b. rome
c. egypt
d. byzantium

the answer is option a.

b.   jim crow laws were enacted in northern states.

richard milhous nixon (january 9, 1913 – april 22, 1994) was the 37th president of the united states, serving from 1969 to 1974, when he became the only president to resign (quit). he is also known for corruption and the watergate scandal which resulted in the public losing trust in him and his resignation.

d.)   when the us left nato after the end of the cold war and they had to evolve to focus on more humanitarian measures with the smaller budget