Why was the 18th amendment repealed by the 21st amendment?

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.

Which fundamental right is protected in this excerpt ?

What was a northern objection to the kansas-nebraska act?