The fordney-mccumber act of 1922 boost the american economy by a) prolonging the animosities in europe. b) applying high taxes to foreign-made goods. c) creating tax loopholes for big businesses. d) making loans to foreign countries illegal.

B--applied high taxes to foreign-made goods. --The tariff was one of many measures in the 1920s to put the US back into isolation.

The tariff made imported goods more expensive which in theory should have increased US jobs and production. However, European countries then put tariffs on our goods reducing the market for US goods.

i believe it would influence their own way of understanding things. it shall be a foundation where they can draw or start an argument.   historians are also  scientists that  have their tools of analysis and expertise to unlock a variety of difficulties such as relationships of man, origin, politics, economy, and culture. based on facts and understanding on these areas, they may shade light to extract ideas and develop options to validate a hypothesis or debunk it.