How did the ideas of social darwinism influence politics during the late 19th/early 20th century?

Social Darwinian extended into theories of race and racism, eugenics, the claimed national superiority of one people over another, and immigration law.

in 1803 the louisiana purchase took place, doubling the size of the country. by 1840 almost 7 million americans had migrated westward in hopes of securing land and being prosperous. the belief that settlers were destined to expand to the west is often referred to as manifest destiny.

explanation:

b) the confederacy had to pay all union war expenses.