The answer is A, checks and balances system. The power of courts determines what the government does, in accords with what the Constitution provides.
Cause is what happens and effect is the result of that action
People flocked to California to fulfill the idea of owning new unclaimed land. There was also a large rush to California when gold was discovered there, although very few people became rich.
That was the Treaty of Versailles, and was negotiated by the leaders of the US, France, Great Britain, and Italy (the Big 4)
