Transportation Revolution

I listened to American history lectures with Audible app this morning. One of the topics was transportation revolution in the US. 

The first step was steam boats. Steam boats could shorten traveling time. Rivers played important role for early American transportation. Many big cities appeared along river side. 

And then many canals were made for boats. Many cities combined with canals. Building canals cost a lot. Railroads replaced them. 

That was the outline. 

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