Both of our countries are pretty bad at voter turn-out, I believe.
I notice that for Brexit, leave won over stay by a little over 1,000 votes, and about 13,000 people didn't vote. I don't know the figures for our 2016 election, and each state was different, but I'd guess we were even worse.

Part of me wishes voting was mandatory. All of me wishes it were easier for everybody

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Correction: add a "," and "000".
So it's stay won by 1,000,000, and 13,000,000 didn't vote. (rounded)