if you are a human male there is 80% chance you were born to be a slave or cannon fodder

Women are only attracted to the top 20% of men. Also very few men are needed to make babies - one men can knock up hundreds, even thousands of women.

In the face of the above facts a question arises, why the fuck then is the men/women ratio naturally ~1/1? The answer is simple: while very few men are needed to fuck and make babies, someone must take care of them and the women. And thats what the rest 80% men are for.

Originally they were killed off in tribe wars or enslaved to gather resources for the top ones and their offsprings. Thats the natural order and the time when studies show 17 women reproduced for every man. However, as the societies got bigger and more complex, the ruling class realized these wifeless men are quite an explosive force. Being so beta they will never rebel all by themselves, but they can rally behind another alpha who can, by promising them better future, use them to overthrow the current alpha leaders.

Somehow these men had to be calmed down at least a little, they had to have at least something to lose in a potential rebellion. Thus, around antiquity, monogamy was gradually introduced to tie the men down, give them stake in society and thus be better and more obedient servants. Sure, alphas still got more girls in their unofficial harems, the servant betas got cucked here and there and their wife treated fucking as a chore, but they were nevertheless better off than before. With the advent and spread of christianity, monogamy was to become a rather heavily enforced standard in western civilization for the next 2000 years.

However in the past 50 years we have started to again drift towards the situation when the betas are extorted via taxes while getting steaming shit in return. Again, more and more men have less and less stake in society; even if the change started slow it seems to have become exponential with the advent of online whoring. We will see how it goes this time - porn, vidya and VR have a vast sedative effect, which could mean there will be no mass rebelions or similar discontent this time. But that only makes the society a ripe target for more more masculine societies to take over, as we see today in europe.

If anyone is interested in what effect polygamy has on societies, google polygamy+criminality or similar. There are actual studies done on the topic and lets just say here that theres a good reason all the non-fucked up societies are monogamous.