D. The idea of separate but equal came about in plessy vs ferguson in the 1870s and brown vs board of education sought to discontinue the old practice of segregation in this instance in public schools.
The answer is most likely D. Refused aid to any nation at war. If the U.S. remained neutral, it would not have to worry about going to war/being attacked by a nation at war with another.
Hope this helps! Brainliest is always appreciated!
Spain and France both were allies of the colonists
