How would you vote and what would be the results of this nationwide ballot referendum?

[Kahane's Grave Is A Gender-Neutral Bathroom]

I do wonder if the US had a nationwide referendum, which question lead to a result closest to current partisanship and be the most divisive?

Gun control could end up as a 50-50 issue and match partisanship, but I'm not sure if it is the most divisive issue. Anything racial would be incredibly divisive but it would be hard to get a question that doesn't favor one side. After all, many moderate Democratic positions on it poll well but a question that leans too much to the 'abolish ICE' or 'defund the police' side would likely be a blowout the other way.

Well it depends on how gun control is phrased. Something like 'eliminate the 2nd amendment' probably fails by at least 65-35, while something like 'institute background checks for gun sales' probably passes by double digits.

[Kahane's Grave Is A Gender-Neutral Bathroom]

I do wonder if the US had a nationwide referendum, which question lead to a result closest to current partisanship and be the most divisive?

Gun control could end up as a 50-50 issue and match partisanship, but I'm not sure if it is the most divisive issue. Anything racial would be incredibly divisive but it would be hard to get a question that doesn't favor one side. After all, many moderate Democratic positions on it poll well but a question that leans too much to the 'abolish ICE' or 'defund the police' side would likely be a blowout the other way.

Well it depends on how gun control is phrased. Something like 'eliminate the 2nd amendment' probably fails by at least 65-35, while something like 'institute background checks for gun sales' probably passes by double digits.

'Institute background checks for gun sales' has run behind normal Democratic numbers in a bunch of states (NV and ME come to mind); I suspect it would be a narrow loser. (OTOH, affirmative action has run like 40 points behind Democratic numbers). On the still other hand, an abortion referendum can easily run like 30 points ahead of Republican numbers, as KS and WV demonstrated recently. Marijuana runs well ahead of Democrats, but other drugs run well behind them; I kind of suspect a decade from now some form of general drug decriminalization would run at about 50/50 nationally.

Legitimately a toughie. Maybe taxes very explicitly meant to help some very sympathetic constituency, like teachers or the military? Taxes for even kinda-sympathetic constituencies, or where who they're targeted at is emphasized (even if that's a seemingly-unpopular group like billionaires or whatever) go down hard, but certain things to tend to match general partisanship. (On the hyper-local level, even to exceed it, and at the state level this would've been true even 10-15 years ago, but not really so much anymore).

Depends if it is phrased as a tax. If it is, it probably runs well behind what it might have if it was characterized as a program. For instance, MA's 4% tax hike on the rich passed by the same margin as Colorado's 'free school meals' referendum, despite MA being much to the left of CO.