Europeans will also be watching election developments in Israel and Iran.
Stay up to date with all the latest election developments as the results roll in with our live-blog.
Earlier in the evening, in the Roxborough neighborhood, several miles south of Chestnut Hill, Sandy Sorlien and John Arnold were in the living room of their Victorian home, watching the latest election developments on "The News Hour with Jim Lehrer" on PBS.
In other election developments: Lord Mandelson has warned Labour against a quick "beauty contest" for its leadership, saying it needs a profound rethink about its future.
In other election developments on Friday: In Gwent, where turnout was 14.3% overall, one polling station in Newport was visited by no voters at all.
In other election developments on Tuesday: The Conservatives said they would give the NHS whatever funding it needs amid a row with Labour over GP appointments.
In other election developments: Devon and Cornwall was the final PCC area to declare in the early hours of Saturday morning.
In other election developments: Mr Cameron is set to make Michael Gove the justice secretary and Chris Grayling leader of the Commons in his new Conservative government.
In other election developments: Nick Clegg attacked the Conservatives' plans for the economy as he stepped up his attack on his coalition partners since 2010.
In other election developments: The BBC forecast, with 643 of 650 seats declared, is Conservative 331, Labour 232, the Lib Dems 8, the SNP 56, Plaid Cymru 3, UKIP 1, the Greens 1 and others 19.
In other election developments: Chuka Umunna, Andy Burnham and Yvette Cooper have all been tipped as potential Labour leadership contenders after Ed Miliband stepped down but Tottenham MP David Lammy is the first to publicly ponder a bid.
