How has 9/11 changed our ''physical world'' over the past 10 years?

       When I interviewed my mom about 9/11 she answered like this: The events of  9/11 have changed a lot of things around the world.The world is not safe any more, or at least we don't think it is.There is a lot of suspicion and there is a lot of intolerance toward people with different religion and different ethnic backgrounds than us.Traveling is not as safe anymore or is not that easy anymore.There is a lot of security,every where at the airports.This is because a war started, and because of this war many soldiers and civilians have died that count to thousands.Relations between east and west have become very intense and we think whoever is different than us is deemed to be suspicious.