Why was the invasion of Iraq controversial? How did the war proceed?

The war was controversial due to the question of legality and whether or not the evidence justified going into war. Many also thought the US had higher security priorities rather than Iraq.

How did the war proceed?

Answer:

The Gulf War is controversial because the US invaded Iraq and basically shaped the country as they wanted politically using intimidation. Many American are against the war because the US exploited their power and used it most possibly to seize some oil stocks held in Iraq.

The war was also controversial because it raised deeper issues of principle and precedent.

Explanation:

Including whether and under what circumstances the use of force may be a legitimate and effective response to the proliferation of NBC weapons; whether and under what circumstances the removal by force of governments or leaders-'regime change'-may be a legitimate and wise policy; the role of the UN Security Council in arriving at decisions of this kind given the inherent limitations of that body; and the role of the USA in world affairs given its overwhelming power.