"It's way overdue," the 44-year-old English pop star told The Associated Press. "It's something that happened ... almost without a whisper in England, but it was basically because we weren't that concerned about the word `marriage.'"
Michael, who is openly gay, said, "because this is a much more religious society, there are a huge number of people who want (their) unions to be part of something that they can place in their religion, so (marriage is) much more important here. I think that's why it's so long in arriving here, but I think it's fantastic, obviously."
The next day, Michael kicked off the multi-city "25 Live" tour at the San Diego Sports Arena.
Why so long between concerts here?
"The '90s were a bit of a disaster for me in so many ways. On a personal level, I don't think I could have toured. Also, I had some physical problems with my back that are now sorted and I just wasn't in the right state of mind," he told the AP.
Michael, who recently released his greatest-hits album, "Twenty Five," in the United States, has said this will be his last arena tour because he wants to lead a quieter life.
"I have got other interests than just making music. I would like to follow those interests through. You never know, in five years I might be back here begging you all to forgive me," he said. "But I really think I can do much more constructive work as an artist if I step out of this again."
Michael sang in the 1980s pop group Wham! before stepping out for a successful solo career. His hits include "Faith," "Father Figure" and "One More Try."
He has had several run-ins with the law, on charges ranging from drug possession to lewd conduct.
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On the Net:
George Michael says he was sober during car crash
Aug 15, 2009 6:00 pm PDT
George Michael has been questioned by police after his car was involved in a late-night crash near London. Thames Valley Police said only that a 46-year-old man was arrested after a Land Rover hit a tractor-trailer on the A34 road early F...
George Michael apologises for latest drugs bust
Sep 22, 2008 7:00 pm PDT
British pop star George Michael apologized to fans on Sunday and promised to "sort himself out" after his arrest and caution by police for possession of drugs. Michael, 45, was arrested in a public toilet in the north London suburb of Ham...
George Michael's tip for Obama -- run with Clinton
Jul 22, 2008 9:00 am PDT
British pop star George Michael has a tip for U.S. Democratic presidential candidate Barack Obama -- team up with former rival Hillary Clinton. Michael, 45, touring North America for the first time in 17 years, told fans during a conc...
George Michael keeps the faith at L.A. concert
Jun 26, 2008 8:00 pm PDT
The audience at Los Angeles' Forum gave George Michael a special present just before the second half of his two-hour performance Wednesday: a spontaneous arena-wide "happy birthday to you" for the English singer, who turned 45 on W...
Last Night With George Michael
Jun 18, 2008 5:00 am PDT
George Michael showed off more than just his voice last night during the opening show of his new 25 Live tour. "You could tell he wasn't wearing underwear," reports a concert-goer at the San Diego Sports Arena. "It was flo...