Ten years after the 9/11 attacks, Americans were reasonably positive about the state of their rights and liberties. Today, after 20 years, not as much.That’s according to a poll by The Associated Press-NORC Center for Public Affairs Research that builds on work conducted in 2011, one decade after the pivotal moment in U.S. history. Some questions were also asked on polls conducted in 2013 and 2015.Americans were relatively united around the idea that the government did a good job protecting many basic rights a decade …