The biggest factor in America's high divorce rates is, by far, the advent of no-fault divorce starting in the 70s.

I think there's also something to the cultural tropes and propaganda we've seen since then portraying marriage as dull, monotonous, and oppressive while lifting up devoting one's life to an office job, travel, and 'exciting' flings as the path to self-fulfillment. When nothing could really be further from the truth - there's a reason millennials and gen-zers are horribly depressed and dying enough deaths of despair from drugs and suicide to bring down the average lifespan.