Which war resulted in territorial gains for the united states that caused sectional conflict in the years leading up to the civil war?

The Mexican-American War will be your answer

This war took place in the south west, from Texas to California, all the way to Mexico City

hope this helps

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Opposition to the nra came to a head in 1935, when the conservative supreme court declared the agency unconstitutional, claiming the nra gave the executive branch regulatory powers that belonged exclusively to congress. this decision began a series of court decisions that overturned key elements of the new deal.