What did the Supreme Court ruling in Plessy v. Ferguson allow Southern states to do? a. block efforts to segregate public schools and colleges
b. stop African Americans from migrating to the North
c. maintain separate facilities for African Americans and whites
d. prevent African Americans from registering to vote

The answer you are looking for is A, block separate facilities for African-Americans and whites.

Explanation:

operation overlord was the codename for the battle of normandy, the allied operation that launched the successful invasion of german-occupied western europe during world war ii. the operation was launched on 6 june 1944 with the normandy landings

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.