Which answer best describes one way that territorial gains affected the United States?

If you are talking about them trying to expand in to present-day Canada, then it brought renewed conflict with Britain (war of 1812)if it is towards the west, i guess it hampered technological development, because most people were moving west through the trails, instead of staying to help build up the economyhope this helps

This answer comes from question

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by 1880, germany had more rail lines than great britain and russia.