Nixon worried about being reelected in 1972 largely because he had

The answer is: narrowly won the popular vote in 1968

In the election of 1968, Nixon only won the popular vote by around 0.7% Margin.

This amount of lead is extremely unstable for a presidential candidate since small mistakes and one bad reputation from the media could completely turn the vote away from him.

the answer is b: the religion they practice.

here's why:

there were many different native american tribes and those with similar characteristics formed a main tribe or nation. each had its own language, religion and customs.

b)

it created free trade throughout the colonial territories.