State of Slovenes, Croats and Serbsball

 was a historical unrecognized Slavic stateball. His flag is similar to Netherlandsball's flag.He became Yugoslavia.

History
Before World War One, State of Slovenes, Croats and Serbsball was a part of Austria-Hungaryball. As time went on, he wanted Austria to gib independence. After Austria-Hungary was kill, they declared independence but nobody recognized them, so they got anschussed by Serbiaball, creating Yugoslaviaball.