Use the passage below to answer the following question:

[T]his race of unequaled energy, with all the majesty of numbers and the might of wealth behind it-the representative, let us hope, of the largest liberty, the purest Christianity,…will spread itself over the earth…[T]his powerful race will move down upon Mexico, down upon Central and South America, out upon the islands of the sea, over upon Africa and beyond. And can any one doubt that the results of this competition of races will be the "survival of the fittest?"—Vincent Ferraro, Resources for the Study of International Relations and Foreign Policy, Mount Holyoke College International Relations Program, 2010

What 19th century philosophy is described in this excerpt?
Manifest destiny
Market capitalism
Social Darwinism
Marxist communism

i think they would live in caves or natural tunnels

in the 1800s, 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.

its b wells tried to fight lynching in the south by