But not on this watch.
Sodom only needed to find ten righteous men in order to survive. When "America" gets to that point, when there are no longer ten righteous men left, we won't be here and we won't care that the time has come, because it won't be America any longer.
It is our duty in this time to work to prevent that.
Sodom couldn't have had a population of more than a few thousand, if that. The US has what now? 350,000,000? I don't think there's any particular significance to the number ten other than in the specific case. Not ten righteous out of 350,000,000? Don't be silly.
I also don't think we're under any special protection as a country in the first place. More a question of actions having consequences.