They closed their borders and turned inward because they wanted to stop people from learning other religions. Two results are that they could no longer trade and they were confined to themselves.
T∅P
The most important holdings were Angola and Mozambique
-Water ways were major improvements to the US to help w/ transportation.
-steam engines helped by allowing railroads to be built and transport items
-this allowed more jobs to be useful for the US to grow
Franklin D. Roosevelt
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