Why were Americans angered over Asian immigration?

the 1850s, Chinese workers migrated to the United States, first to work in the gold mines, but also to take agricultural jobs, and factory work, especially in the garment industry. Chinese immigrants were particularly instrumental in building railroads in the American west, and as Chinese laborers grew successful in the United States, a number of them became entrepreneurs in their own right. As the numbers of Chinese laborers increased, so did the strength of anti-Chinese sentiment among other workers in the American economy. This finally resulted in legislation that aimed to limit future immigration of Chinese workers to the United States, and threatened to sour diplomatic relations between the United States and China.

abraham lincoln  (february 12, 1809  – april 15, 1865) was an american statesman, politician, and lawyer who served as the 16th  president of the united states  from 1861 until  his assassination  in april 1865. lincoln led the nation through the  american civil war, its bloodiest war and its greatest moral, constitutional, and political crisis.[2][3]  he preserved the  union,  abolished slavery, strengthened the  federal government, and modernized  the u.s. economy.

these civilizations were located around fertile rivers, where they could produce an abundance of crops