It is extremely rare for an election to be undecided at 60 days (Bush v. Gore was decided after 35 days, for example). If you're talking about the 2020 Presidential election, the reported counts were sufficient to determine (not "predict") the winner within about 18 hours of the last poll closures or thereabouts. It was politically convenient to spin the remaining counting, certification process, inevitable legal challenges, as "uncertainty" when there really was none.

Happens in Canada too. Probably because we have them every like 18 months.

[edit] The last one, Parliament was dissolved September 11, 2019, the vote held on October 18th and results announced on the 21st.

You have to be less accepting of mail in ballot delays.

Nationalize elections? Use electronic voting machines exclusively? Literally the only reasons it works in Brazil (and things which will literally never happen in the U.S.)