User blog comment:Commdor/Questions for Mass Effect 3/@comment-65.166.101.165-20110109070312/@comment-211.30.37.34-20110331081826

London is better than D.C. End of story.

Besides, BioWare probably at first wanted it to be in an American city, but they probably got a lot of heat about it - so they changed it to Europe to cater to international players.