How would the US not having nukes helped Irak? Conventional invasion of the US is impossible unless the the attacker has total sea superiority or a strong forwa

How would the US not having nukes helped Irak? Conventional invasion of the US is impossible unless the the attacker has total sea superiority or a strong forward base in the Americas. The US can and will maintain its dominance there with conventional means. Air or missile strikes against US territory are very difficult to pull off. Only China or Russia would have any chance to overwhelm US missile defenses. Anything small-scale would be answered by conventional strikes and a ground invasion. No nukes are warranted unless entire cities get slagged or nukes or biological or chemical weapons are used.