After US troops withdrawal from South following reconstruction what happened.

The Compromise of 1877 was an unwritten deal, informally arranged among U.S. Congressmen, that settled the intensely disputed 1876 presidential election. It resulted in the United States federal government pulling the last troops out of the South, and formally ending the Reconstruction Era.

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i know social security wasn't one.

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hope my answer has you!

the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.