When did the Jim Crow period begin?

What did Homer Plessy try to do?

The Jim Crow Period began in 1877.

Explanation:

Homer Plessy refused to move from a segregated rail car that was for "whites only". Later, The Jim Crow period began.

giant impact theory - the moon was formed from the collision between earth and another mars-sized body.

colliding planetesimals hypothesis - the moon was formed from the same cloud of material as earth.

capture hypothesis - the moon was locked into orbit by earths gravity as it was passing by it.

accretion hypothesis - the moon was formed from collisions and combining of planetesimals.

i think this is right, if not and you know better let me know.