> It has kept the title, but so has France and how many Republics are they on now?

The US has also kept the title of the Senate, but I'd argue that it's been a very different institution since the 17th Amendment. Also, the Federal govt. until the Great Depression was much more hands-off (witness the overuse of the Commerce Clause since then.)

I'm not sure that the Founders would think of the present-day Republic as the same as theirs.