The decision wasn't good because they weren't correctly calculating
President is allowed to make treaties, nominate and appoint ambassadors, judges of the supreme court, with the advice and permission of the Senate.
The Erie Canal is a canal in New York and connects the Great Lakes with New York. Railroads and canal benefit shipping goods because it is faster instead of going by wagon or horse
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No country would mess with South America. As that was what the Monroe Doctrine was it said that the US would protect South America from Europe
Marco Polo found a new trade route (possibly several) that expanded trade in Europe.
