When will we know the 2022 midterm election results? Here's why some states take longer to tally votes

The last polls in America in the hotly-contested midterm elections closed at 1 a.m. ET Wednesday in Alaska. But there are still races to be called.

As of early Wednesday, CBS New projected that control of the Senate remained a toss-up, with five contests yet to be called: Arizona, Georgia, Nevada, Wisconsin and Alaska. CBS News projected that House control, meanwhile, leaned Republican but several key races had not been called. 

There are a number of reasons it can take longer for ballots to be counted in some states. Here is a breakdown of some battleground states and their rules around counting ballots: