Question

6 reason why there are more divorces today

Answer 1

Completely subjective.

But I must say:
Birth control creating a casual attitude towards copulation.
What I would do if I were you is look into the sexual revolution in the US and trace specific turning points--shift in attitudes, etc.

Answer 2

Social conventions: During the red scare, around that time at least, there was a focus on the american family--divorce was incredibly uncommon..but to be honest I wouldn't say there are specific 'reasons'