Green Day is number one on the American charts selling 267,000 copies of American Idiot just in America, and they are also number one in the following countries; Canada, Japan, Italy, Australia, and the UK (which sold over (200,000).
Green Day is the UK's Favorite band: Read more here

Since the site went down i've been trying to gather all the stuff i have. I have about 12345981374 articles about Green Day taking over number one on the Billboard, so I'll just give you the important ones, along with a few more reviews of American Idiot:
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December 2017
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Happening this month:
Dec 09:
Happy Birthday Tre Cool! He turns 45 today.
Dec 25:
Merry Christmas!
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