What are tariffs, and why do governments sometimes use them?

A tariff is a tax or duty to be paid on a particular class of imports or exports. Governments sometimes use them to raise revenue or to protect domestic industries.

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.