America was a wonderful experiment— and it worked just fine for quite a while, before among other things, we became a giant company. Once you trade with the entire Earth, you can’t offend anyone, because they will stop buying your products. Best to build a wall and take care of your own. We can be a magnificent people, we just have to get frosty and start over.
It's the story of the Old Testament. Those who love God worship God, build great societies, once there decide they know better and forget God, and everything goes to hell and suffering follows until they turn again to God.