How does the supreme court prevent the president and congress from abusing their power

The ancient greek city-state of sparta was run as an oilgarchy, meaning

Is karma the same as destiny, in the sense that everything that happens to you is predetermined? do you believe that "what goes around comes around," and if so is this the same as karma? does everyone get what they deserve, in the end?

What is the main social system that existed in ancient china?