The red scare of the 1920s was a terrible event in the history of America and it led the Congress to immediately pass the Emergency quota Act of 1921.
The emergency qouta act was introduced basically to reduce the rate at which foreign born immigrants or citizens were coming into America.
Native born Americans saw immigrants from other countries as a threat and although the number of immigrants increased prior to the red scared of 1920, the Emergency qouta act reduced influx of foreign citizens into the United states. Statistics showed that the number of immigrants was significantly reduced by half the originally published number.
At the time, North and South Korea were just known as Korea, so it's neither of those two. I'd probably guess Hungary since it's closer to Germany than Greece is, but I'm not 100% sure.
