What were the weaknesses of the treaty of versailles?

This passage says that the government is necessary because . the passage states that checks and balances are needed to

Why did un coalition troops battle iraqi forces in 1991? iraq had invaded saudi arabia, along with its other border nations.iraq had invaded kuwait, which was a major source of the world's oil.the united nations wanted to remove saddam hussein from power.the united nations wanted to prevent the trade of illegal drugs.

Who was the first explorer to sail all the way down the mississippi river