Please help!, why would somebody want a tariff(tax on imported goods) ???

well a government imposes taxes on imported goods to protect native producers of that item. like american producers of, say, tennis shoes would want a tariff on imported tennis shoes because they would argue that they have to spend more on labor, etc. when consumers have to pay a tariff on top of the price for an imported good, it a lot of the times makes the difference between the home good and the foreign good negligible. so they're more likely to buy the home good.