Kwanzaa, the seven-day cultural celebration for people of African descent that began Monday, has come a long way since California activists created it nearly 40 years ago in the aftermath of the Watts riots in Los Angeles. "Like most holidays, Kwanzaa is now part of the American landscape," said Bill Jeter, a Twin Cities artist and teacher. Indeed, Kwanzaa is so mainstream that it has been featured on a U.S. postage stamp. Counselors use its "Nguzo Saba" - Swahili for "Seven Principles" - in treatment programs, and Kwanzaa "rite of passage" programs for young girls are fairly common. In short,...