How did John Brown’s raid divide the Union even more?

Although the raid failed, it inflamed sectional tensions and raised the stakes for the 1860 presidential election. Brown's raid helped make any further accommodation between North and South nearly impossible and thus became an important impetus of the Civil War.

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the answer is b, encourage free trade

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.