They had a civel war and the nationalist side won
The delegates who attended the Constitutional Convention were considered "Stars"
The great depression happened after ww1. we were focusing on our own country to rebuild the economy. and production slowed down. and stock market crashed<span />
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Although there are no right answers I'd say the Louisiana Purchase because it gave a huge amount of land and helped with transporting goods across the country. Making it easier to get resources that would otherwise take a long time to transport.
Be sure to change words and parts of my answer otherwise its just plagiarism and you could get an F.
Answer:
The Monroe Doctrine was successful in keeping the United states out of European affairs because after it was issued there was a decrease in foreign conflict for nearly 100 years until WWI.
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