what are 4 changes in security in the us since the terrorist attack on the wtc and the pentagon?

Question

what are 4 changes in security in the us since the terrorist attack on the wtc and the pentagon?

Answer 1

PM: Debunking The 9/11 Myths - Mar. 2005



http://www.popularmechanics.com/science/defense/1227842.html?page=1&c=y

Answer 2

Travel: stricter screening in airports and at seaports

Financial: Patriot Act-banks, lenders etc are required to more diligently obtain and verify identity of persons they do business with to prevent from doing business with known terrorists.