Kingdom of Italy was surely not a military power and sort of a joke to a nation. We're not talking of Kingdom of Italy here... also because it was born way after the introduction of Hussars, and even if, it had its regiment of hussars, "Ussari di Piacenza". I don't know about the other nations you mentioned and I won't go around investigating, but I'm sure you will find cavalry regiments named after Hussars anywhere in Europe, sooner or later in time. It's obvious that they were first called Hussars in Hungary, but they weren't unique to Hungary and like I said their name was adopted (in time...

) by all great powers of Europe. And AFAIK Dragoons are not considered light cavalry. Hussars were light cavalrymen armed with light firearm. Is this an invention ? It could be if at least those light firearms were invented by Hungary and unique in that nation. Or if Hussars was a name used only by Hungarians. But this is not the case. What I think and I'm trying to say is that considering Hussars a UU and even worse an
invention would be the same as considering swordsmen a UU for the first Civ who ever adopted swords in their army for first. It's the same with Swiss Guards as UU for Netherlands. They were not the only ones to hire them.