A new YouGov survey on the September 11, 2001 attacks explores how Americans see the impact of the attacks 25 years later, including whether Sept. 11 should be a national holiday, how Muslims are treated compared to people of other religions, and whether the War on Terror has been worth the cost.About half (51%) of Americans think Sept. 11 should be a national holiday to commemorate those who died in the 2001 attacks. 26% say it should not be a national holiday. Republicans are more likely than Democrats to say it should be a national holiday (62% vs. 43%).27% of...