Now the system is controlled by an American oligarchy...
Not much actually changes then does it?
I wonder what happens if you compare average living standards to other colonial countries like Canada and Australia. The US likely has the greatest wealth inequalities on earth, and the lows are pretty damn low - considering the highs.
Things are constantly changing, if they did not we would still have slavery...
In order for things to change for the better, people have to constantly participate to make changes to the system that benefit the majority of the population, so we don't have to have violence/rioting.
The USA has had regressive changes for the last 40-50 years because people became complacent, people at the bottom have reached a breaking point, we will see if this breaking point will bring progressive changes, only time will tell.