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The entire world's attention is on the United States tonight, as the country finally decides whether Hillary Clinton or Donald Trump will become the next president. Whichever candidate wins, what they'll be actually be able to accomplish in office will be largely determined by the results of tonight's Senate races.

There are 34 Senate seats up for re-election this year, consisting of 10 Democratic seats and 24 Republican seats. To gain control of the Senate, Democrats need to gain four seats — five in the event of a Trump presidency, as the vice president serves as the tie-breaker for all Senate votes. 

As of Friday, Nov. 4, FiveThirtyEight gave Democrats a 61.2% chance of winning the Senate in their polls-plus forecast, but the site also noted there are more close Senate races in this election than at any point over the past 30 years. And with Republicans already threatening to block any Clinton-appointed Supreme Court nominees, and the possibility of even worse Congressional gridlock looming ahead, the outcome of these tight contests may be more important than ever.

Races to watch tonight include those in Wisconsin, where former Democratic Sen. Russ Feingold fights to take back his former Senate seat from Republican Sen. Ron Johnson; Nevada, where retiring Sen. Harry Reid's seat will go to either Republican Rep. Joe Heck or Democrat Catherine Cortez; and Pennsylvania, where Democrat Katie McGinty is currently favored to take over the seat held by Republican Sen. Pat Toomey. Other close races will take place in Indiana, New Hampshire, North Carolina, Missouri and Florida, where Sen. Marco Rubio currently maintains a small-but-stable lead over Democratic challenger Patrick Murphy.

Keep track of these competitive races with our live Senate Election Night results: