The Freeport doctrine was Stephen Douglas’s doctrine that said slavery could be excluded from territories of the U.S. by local legislation. (Brainliest answer please) :)
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⭐Supplies had to travel a long distance across water on ships that were often attacked, so they did not reach Europe...
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Provided railroad companies land free of charge.
In order to help expand railroads throughout the country after the civil war, congress made railroads expand significantly; bringing even remote parts of the country into a national market economy.