Americans have not, in fact, become more tolerant.  Rather, they have shifted their dislike to new groups.  For example, “Muslim clergymen who preach hatred against the United States” are now the least liked group included in the General Social Survey (GSS), followed by people who believe that “blacks are genetically inferior”.   Most importantly, compared to those in their 40s, people in their 30s and 20s actually show lower tolerance towards these groups.  According to the 2012 GSS, people in their 40s are the most tolerant of Muslim clergymen who preach anti-American hatred: 43% say a member of this group should not be allowed to give a public speech in their community.  Among people in their 30s, the number who would prohibit this group from speaking climbs to 52%, and for those in their 20s it jumps to 60%.  Young people are also less tolerant than the middle aged groups toward militarists, communists, and racists.  This is not true for tolerance towards homosexuals or atheists, because younger people simply like these groups more. (Political tolerance is not a measure of liking someone, but the willingness to extend political freedoms to those one dislikes).