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It was the first armed war.
All of those are a part of Great Britain
Yes it was because Nixon helped cool relationships between the countries which could have made it less likely for nuclear war and tensions between the countries.
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The gilded age was a period of economic growth as the United states jumped to the leas in industrialization ahead of Britain. the nation was expanding it's economy into new areas, especially heavy industry like factories, railroads, and coal mining. hope this helps :)
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Im not entirely sure if im right but i think its c. Sorry if i get it wrong