We are currently at a crossroads in the U.S., where men are refusing to marry women at the highest rates in our history, where children are growing up without fathers, and where the base population is declining (if you discount immigration).
As Sandman points out here, no society in history with a declining population has survived over the long term:
This decline hit the Spartans, the most warlike society in history, their entire male citizen population was trained from the age of seven to twenty to be professional warriors. This was a good thing, if you're fending off an attacker like the Persians at the battle of Thermopylae, one of the most famous battles of all time. So much so, we're still talking about this 2500 years later.
So, how did the Spartans fall? Were they killed off by an attacker? No, not really. Like all populations, the Spartan population replenishment, depended on the women. And the women in Sparta had special privileges, unheard of in the ancient world. The Spartan women held all the property, this gave them an extraordinary amount of power. Spartan women were notorious for speaking their mind. They were able to divorce if they wanted to. They could even have a younger lover if they wanted. They were able to wear more revealing clothes, and exercise in the nude. In other words, the Spartan women acted a lot like the women in western civilization do today. Eventually, they took their men's power. The women of Sparta turned the greatest warriors in the history of the planet into compliant Beta providers. Eventually the men stopped procreating with the women, and the population declined. Sparta didn't fall, it crumbled and disappeared.
If we don't take the lesson of the Spartans, people will talk about the United States the same way as Sparta. How we had the most powerful military ever seen, yet we turned the Country into a default Matriarchy, and disappeared. Not like the Romans, who lasted a thousand years, but the Spartans, who only lasted a few hundred years.
The population cycle drives human history