It didn’t last over two hundred years. It failed utterly in 1861 and wasn’t restored until 1865. That was only 160 years ago.

It probably would’ve failed again in the 1930s but the Roosevelt Democrats were able to take control of both the legislative and executive branches and make them irrelevant, and then the rest of the world bombed itself into the dirt, allowing America to become fat and rich enough that you didn’t notice the rot.