The correct answer is D)macadam. Macadam was an invention keyed by a Scottish man who changed the way we view paving of roads and highways. Macadam is a mixture of small stones crushed together with asphalt, the sticky, black material used for both concrete and macadam. The name Macadam comes from the engineer's name, which was John Loudon McAdam. There had been other attempts at macadam before McAdam, but McAdam improved it and his was the first to arrive in the United States.
The United States kept to itself because it was following an isolationist policy at the time
Effects of Imperialism - Imperialism is when a mother country takes over a smaller nation or colony for political, social, and/or economic reasons. ... A positive effect is seen in document one called "Modern Progressive Nations," it shows how the larger nations gave to the smaller colonies.
Answer:
Slaves and crops.
Explanation:
The more land they had the more crops they could grow to earn money. And the more crops they grow they needed more slaves.
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Containment was a United States policy using numerous strategies to prevent the spread of communism abroad. A component of the Cold War, this policy was a response to a series of moves by the Soviet Union to enlarge its communist sphere of influence in Eastern Europe, China, Korea, and Vietnam.