How did united states change socially between 1776 and 1870?

The United States change socially between 1776 and 1870 when declared the 13th ammendment that abolished the slavery. That there will be neither slavery nor involuntary serviture except as a punishment for crime whereof the party shall have been duly convicted. Then the 14th ammendment declared which defined a citizen as any person born or naturalized in the US. This addresses citizenship rights and equal protection of the laws and was porposed in the response to issues related to fromer slaves following the Americal Civil War. Then lastly, the 15th amendments that prohibits denying the right to vote to someone because of their race. These 3 amendments apparently change the United States change socially.

the first historical instance of china engaging in internationalism was during the han dynasty.[1] at the start of the han dynasty, the huns in the north were attacking the frontiers of han and trying to obtain riches. emperor wu of han wanted to gain an alliance with a country called dayuezhi so the two countries could join together and fight against the huns.[2] to obtain this alliance, emperor wu sent zhang qian to the west to establish economic and cultural connections.[2] history records that during the han dynasty there were four primary avenues of contact between china and europe. they included the northern land route, the central land route, the southern sea route, and the far southern sea route.[1] the most famous of these routes is the central land route, or the classical silk road, comprising a network of roads stretching from northwest china to the ports of syria and the black sea, which passed through the oasis of the turkestans and northern persia.[1] the silk road was significant for chinese emperors because it provided dominance over central asia by developing resources and provided new markets for the export of china's most valuable resources.[1]