So this is my first post on CivFanatics, and I really wanted to clarify the Austria-Hungary issue. It makes a lot of sense to have the Hussars as the Unique Unit for Austria since Maria Theresia is the leader. One of the most famous episodes in her reign was going to the Hungarian Nobles and requesting their aid against Prussia and France. In one of the most notable moments of her request, she brought out her son, Joseph (still a baby), and asked for help. At this point, the Hungarians, solely out of their choice, announced support for their "Lord and King." While there was conflict between the ethnic groups, Maria Theresia, in this one moment, bridged the gap and it is considered one (of many!) turning point in Austria-Hungary relations.
I don't mind hussars being the Austrian UU. In reality though, hussar regiments were recruited in every major and many minor powers in Europe. However, if Maria Thereasa began all of this, by asking the Hungarian nobles for help against her enemies, then to have the hussar be the Austrian UU, that is fine by me.