How did medieval life and the feudal system break down? (select all that apply)

trade brought wealth and job opportunities to newly created cities.
kings had cities built to give serfs a place to live.
middle-class merchants who made a good living questioned the authoriy of landholders.
the crusades fought for the freedom of serfs and the manorialism way of living. factories employed those who would have been living on manors or under a king.

The answers are

-A. Trade brought wealth and job opportunities to newly created cities.

-C. Middle-class merchants who made a good living questioned the authoriy of landholders.

-D. The Crusades fought for the freedom of serfs and the manorialism way of living.

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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.