Second best would be Israel.
Oh God, unless that power goes to some stoner, we're fucked if it's given to someone with ambition or sociopaths tendencies. I'm either guessing we'll get more mercenary types do to people not generally being that good. Superheroes may come, but they'll be in the minority.For the purposes of this hypothetical, the upper limit is "able to significantly affect the entire observable universe itself".
Yeah, The Boys is generally the most plausible I think. The people with strong powers get paid a pro-sports salary to basically keep all the other supes in line, while stopping the occasional crime and churning out massive amounts of Marvel-like merch and movies. Although that assumes you don't have someone with Superman-level powers who can shrug off nukes deciding to take over the country.Read Worm, watch The Boys and you'd get an idea.
God exists, and he's American.