Y'know, in terms of social unrest, I'd rather have Mexican and Latinos immigrating to the USA, legally or illegally, than Islamic immigrants. Foreigners of Islamic persuasion are boiling over with anger toward the West, and it recurrently manifests itself at seemingly any protest. From US colleges to the streets of Paris. When I think about it, Osama Bin Ladin was a logical and inevitable step in the Islamic diaspora.
The only additional face of the past 100 years that merits addition on to Mt. Rushmore is that of Barack Obama.