I'm not sure, but my noggin and un-researched historical memory suggest to me that the US has lost more wars in the only quarter-finished 21st century than in more than in the two+ prior centuries.

And in the past 22 months that loss rate has certainly increased - to effectively 100% loss.

Good thing the US isn't attempting to defend itself against the Duchy of Grand Fenwick.

(Of course you remember that Peter Sellers film, The Mouse That Roared. You don't?)