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How else can the TV networks know on the day!?!?

I mean, run the elections on Saturday instead. Then you'd have a whole weekend to count without work getting in the way

In other countries it's done manually and results are published as the counting happens and finished within the same day.

Of course the US is large, but I don't see how that's a limiting factor, being the process naturally very parallel.

It used to be the same in the US. Somehow counting seems to slow down the more voting machines we use.