In both wars United States engage themselves in war against non-democratic regimes, trying to establish new ones. Both wars lasted for a long period of time and inflicted heavy casualties, even on the American side.
Explanation:
Vietnam war led to American involvement from 1961 until 1973 and can be seen historically as the greatest defeat in American history.
American reaction in Iraq started in 2003 with a goal to overthrew the regime of Saddam Hussein, who according to them was a treat for American democracy.
