Which statement about the United States in the years after World War I is false? The United States emerged from World War 1 heavily in debt to European
nations.
More widespread use of electrical power contributed to greater industrial
efficiency.
Ford Motors installed the first moving assembly line.
Wealth was concentrated in the hands of a few.

what are local authorities doing to fix the problem

explanation:

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.