One big barrier is economic background. Many students from immigrant parents often can’t afford college or have to work instead of going to school. Another difference can be the language barriers given that it’s harder to learn English than it is most languages because it doesn’t stick to grammar rules as much as others do.
Late 5th to early 10th century AD
The Nazi party targeted Jews, Slavs, homosexuals, people with physical or mental disablities (such as Down Syndrome).
C to isolate the soviets between the NATO and a hostile china