The many changes that event has created are with us 20 years later.
Some say everything changed. We took many actions and failed to do many other things. Some are obvious and some are not.
I will mention the light hearted changes like the movies and comic books. As you may know Superman was born during the WWII war years

Since 9-11 the explosion of superheros battling terrorists of all kinds is Superman to the 10th power.
The TV media has its share of 911 inspired shows, but how 9-11 CHANGED EVERYTHING
IS HERE