Schools in the United States started integrating in the 1950's as a direct result of the Brown v Board of Education Supreme Court ruling.
This document should be the Articles of Confederation
The limits of liberty: the legacy of the American Revolution. Women could not vote, nor could half a million slaves or over a hundred thousand Native Americans. Slavery and racial segregation remained a political and cultural fault line
During World War II there were two sides: the Allies, which the US were a part of, which included, among others, UK, France, Soviet Union (after 1941), and the allies (Germany, Japan, Italy and their puppet states).
So the answer can be any of the allies: UK, France, Soviet Union but also the whole of Latin America, most of Africa and Asia.
