The Mongols had a benevolent attitude toward foreign religions, or at least a policy of benign neglect. Their belief in Shamanism notwithstanding, the Mongols determined early on that aggressive imposition of their native religion on their subjects would be counter-productive.
It would be Japan, since after the bombs dropped US forced the Emperor to stepped down.
I don't know what are your answer choices, but Rock The Vote is an organization that encourages just that. :-)