(Reuters) - High-profile U.S. elections in Georgia, Florida and Arizona remained unresolved on Thursday, two days after the vote, with the prospect of legal challenges, recounts and ballot reviews setting the stage for possible weeks of uncertainty.

The still-undecided races will not tip the balance in either chamber of Congress but include contests in parts of the country important to the futures of both parties and potentially to President Donald Trump's re-election chances in two years.