If given the option, which recent US presidential election would you flip?

Another hypo: Suppose North Dakota decides to allow non-citizens and even non-residents to vote. Trump campaigns heavily in Russia, asking Russian citizens to vote by mail in North Dakota under its new system of allowing non-citizens and non-residents to vote from anywhere in the world. 90% of the Russian population votes from Trump, as a result of which he wins North Dakota by 100 million+ votes, making the votes from the other states entirely meaningless.

To deal with this potential problem, on a legal level, the constitution would need to be amended so that states would not be able to set their own election rules for federal elections. On a practical level, you would almost certainly need to scrap the system of the VP opening the election returns from the states and Congress counting the votes. Because the disputes would increase, not decrease.