How does the idea of the domino theory relate to the spread of communism? It was used by anti-communist nations to oppose the spread of communism one country at a time.

It was the belief that communism would naturally spread as workers united in different countries.

It was the idea that if one nation fell to communism, others would soon follow the example.

It was employed by pro-communist countries to spread communism around the world little by little.

D- Nearby nations would reject communism in their countries.

Explanation:

it refers to race, i am pretty sure this was a popular term in nazi germany or something.

the right answer is the third one: turnpikes went short distances to connect markets. turnpikes, also known as toll roads, were very important for trade and transportation (of people, goods and products) in the 19th century, coinciding with the expansion towards the west. they contributed significantly to the economic development of the united states.