What Mistakes Has America Made In Invading Iraq?

There are several large mistakes that America made in Invading Iraq.  Although they were perhaps correct in removing a brutal dictator, even this is flawed.  Removing Hussein was dangerously stupid for one reason, his reign kept order throughout his country, when he was removed, the stability of the country was also removed.  The American military also made a pretense of understanding the Muslim mentality, the Arab mentality, which simply isn't so.  The invasion was not greeted like Paris 1945.  Instead, the situation has evolved into another Vietnam.  Although Iraq was not involved in terrorism against the USA, the invasion appears to have increased terrorist activities, as the rest of the Islamic and Arabic world deplores what has been done in the name of 'freedom' and 'democracy'.  

Of course, the mistake of invading a country and saying that it was because of invisible WMDs might also be a mistake.

However, strategically, they now are closer for an invasion of Iran, perhaps the larger target.