How Has 9/11 Changed the Physical World In the Past 10 Years?

When I asked my dad how he thought 9/11 has changed the physical world the last 10 years, he answered that air port security has been increased and improved, in many countries.My Father says that the wars in Iraq and Afghanistan are results of the terrorist actions in New York. Fear of terrorism has increased in many places.Today, air port security has improved a lot.