Four items the united states supplied the allies with were: manpower food a boost in morale submarines military equipment

supplies had to travel a long distance across water on ships that were often attacked, so they did not reach europe

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.