What major national-level development happened in the late nineteenth century?

There were many national level developments in the late-nineteenth century. Perhaps the most important was the development of the light bulb by Thomas Edison. Edison's invention revolutionized all aspects of American life ranging from work to leisure. It also inaugurated the modern electrical industry.

answer:   c. the drafting of common sense

explanation:

on april 6, 1917, the u.s. joined its allies--britain, france, and russia--to fight in world war i. under the command of major general john j. pershing, more than 2 million u.s. soldiers fought on battlefields in france.