It's well-known she declared war on Britain and the U.S. (and probably Yugoslavia and Greece) in WWII, but not on the USSR.
However, in WWI, who did Bulgaria declare war on? Serbia? Romania? Greece? France? Italy? Britain? The US? Russia? All the above? Some of the above but not others?
However, in WWI, who did Bulgaria declare war on? Serbia? Romania? Greece? France? Italy? Britain? The US? Russia? All the above? Some of the above but not others?