Sociological factors behind different marriage rates

A person's family structure growing up, their environment, differing maturity rates, women who don't want to lose their freedom, men who just simply want to play around for a bit and not yet ready for the responsibilities of commitment. Also the decline of blue collar jobs, the increase of STD's, and one's economic efficiency; cause if you cant bring anything to the table and provide, then it's just not going to work. All of these can be why the marriage rates differ so drastically in the U.S