Fact Check: How Strong is The U.S. Navy?

"Mitt Romney says the American Navy is smaller than it was in 1916. In a naive ship-counting sense, where big ships and small ships all carry the same weight, that might be true. But what really matters is relative strength: how powerful is the U.S. Navy compared to all the rest of the navies of the world? Over at the Monkey Cage, Brian Crisher and Mark Souva summarize a dataset they created ea ...