Answer:
September 4, 1957
Explanation:
The Little Rock Nine arrived for the first day of school at Central High on September 4, 1957. Eight of them arrived together. However, one of them, Elizabeth Eckford, didn't have a family phone and ended up arriving alone.
However, the Arkansas National Guard was called and they prevented the students fro entering school, under the orders of Governor Faubus.
The most significant changes were the Catholic Church, Commerce, and finally Intellectual Changes. These three were my top choices as how they had the most effect on Europe.