Progressives have a favorite phrase, that of being "on the right side of history." Progressives believe in linear history, and that they are the vangaurd of that history. Yet actual, real history is nothing like that.
Mayans didn't build these temples in the forest, they built them in the middle of their cities. These cities were large, and were more densly populated than Los Angeles is today. Then in a span of 200 years, the population dropped by 90%, and their culture was gone. They never recovered, and the forests took the cities back. The Mexicans and Central Americans live around these ruins, but they are not really the same people and culture, even if they are directly decended from them. History was not linear for the Mayans. It wasn't linear for the Russians, or the Romans, and it won't be for us.
For all their euphoria, progressives can't see the future implications that all of their engineering results in sterility of the population. They offer abortion, birth control, divorce and single parenthood, pornography, STDs, gay rights, student loan debt so people won't start families, high housing costs, low wages, and unemployment. None of that promotes forming families. There is no future for progressives.
The only way we think we are getting by in America today is through immigration, but that doesn't really count. What is happening is that at such a high rate of collapse, we are being replaced by immigrants, not enhanced.
Progressivism is a philosophy of death, and we can't survive by being a me too party. We have to step outside of the culture of death and let it collapse. Either conservative or immigrants will inherit the country after the collapse, just as the Christians inherited Rome.