In the 10 years since the attacks of 9/11, much has changed in the world. Led by the United States, western nations invaded and occupied Afghanistan and later Iraq, removing their rulers and unleashing sectarian violence and insurgencies. Hundreds of thousands of soldiers and civilians have lost their lives at a cost of trillions of dollars, and western military forces remain in both countries. A third war, the War on Terror, has driven changes in the U.S. that have pushed against the limits of what American society will accept in return for security -- measures such as pre-emptive military strikes, indefinite detentions, waterboarding, wiretapping, and invasive airport security systems. As we remember those lost on September 11, 2001, and construction of the new skyscrapers in Manhattan nears completion, most U.S, troops are scheduled to leave Iraq by the end of this year and Afghanistan by 2014. Here is a look at some of the events of the post-9/11 decade, and some of the progress still being made. This entry is part three of a three-part series on the 10th Anniversary of the 9/11 Attacks -- (see also Part 1: The Week Before and Part 2: The Day of the Attacks).