Which statement best identifies a positive effect of westward expansion in the years before the civil war

 The answer is C)Westward expansion led to an economic "boom" in the Midwest, as new cities and markets were connected by rail and canals.

the  wilmot proviso  was designed to eliminate  slavery  within the  landacquired as a result of the mexican war (1846-48). fearing the addition of a pro-slave territory, pennsylvania congressman david  wilmot proposedhis amendment to the bill.

answer: a video that encourages an armed attack on the government.

explanation: it is a violent overthrow to the government.

hope this : )