My 5 keepers:
3 American/made in USA (Schwinn, Gary Fisher, Litespeed)
1 American/made in Japan (Sekai)
1 all English (Hercules)
As far as provenance, 3 are from CL (Sekai, GF, Litespeed), 1 from a garage sale (Schwinn), and 1 given by a friend who said he found it abandoned (Herc).
So thanks to the Eddy Merckx thread, I now realize ... THEY'RE ALL STOLEN!