<span>D. Imperialism
Because Democracy = By The People, For The People
Communism = From each according to his ability, to each according to his need.
Nationalism = YEEHAW MURICA FIRST MADAFAKA #MAGA
</span>
The person above me is completely right
During the Gilded age, society experienced a period where there are so many social issues exist around them, but it was clouded/masked by silver lining (massive economic growth for society but it only enjoyed by a select view followed by massive exploitation toward a certain group)
During the reconstruction Our society realized this defect and started to made several changes