When the Japanese empire was dismantled at the end of World War Two, Korea fell victim to the Cold War. It was divided into two spheres of influence along the 38th parallel. The Americans controlled south of the line - the Russians installed a communist regime in the north, later ceding influence to China.
I think it is the last one if not then it is the first one
The pyramids were made for Pharaoh Khufu
Through the system of checks and balances, the three branches of government check on one another to make sure that no single branch has more power than the other.