is there a way to view all the top guilds from the U.S.?
You'll be able to find all US guilds - just click on 'find', then click on the pen next to the flag choice. However you'll not be able to do further filtering here to find top performing guilds. Instead uyou can check the leader board and here manually go through the list until you find a US guild. Little bit of work around but I hope it'll help you narrow down your search :-)
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