What could the us government have done to improve the economy in european nations before the great depression?

increase protectionism
decrease protectionism
export to european nations
buy european stocks

The correct answer is "decrease protectionism".  Protectionism is related to limit the free trade among Nations and impose quotes to restrict the spending in foreign goods. The use of protectionism has been one of the most common reasons attributable to the development of the Great Depression, therefore if US government had decrease protectionism it would improve the economy in Europe nations before the Great Depression.