In what way did some American missionaries display Social Darwinist ideas when working in other countries?

American missionaries exhibited socio-Darwinian ideas indicating the superiority and strengthening, within society, of those who converted to the religion they were spreading.

Explanation:

American missionaries saw their culture and religion as superior and when they traveled to other countries they reinforced this concept claiming that only followers of that religion would survive the years and the difficulties that society faces. This idea is an example of a concept based on social Darwinism, which applies Darwin's ideas of evolution to society and the economy, stating that a specific group of people would be superior and would survive to the detriment of others.