The United States declared war on Britain in 1812. It did so because Britain refused to stop seizing American ships that traded with France—Britain's enemy in Europe. Sometimes there were also seizures of American sailors. These seizures were known as impressment
The answer is from both east to west and west to east
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The internment camps were also known as relocation centers, once it was a kind of prison where people were locked for some reason. For example, during the World War II, a lot of Japanese people were relocated in these internment camps, because there was fear that the Japanese people that lived in US, would react to the US attacks in the war.
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