Croatia is a country in Europe.
The Kingdom of Croatia had been in existence since 925. It entered into a personal union with Hungary in 1102. With no threat of the Ottomans entering Europe, the Croatian-Hungarian Union managed to remain for longer than OTL. With Serbia a growing threat, the Croats and Hungarians decided to work together and remained close. The Kingdom had also fought various conflicts against the Italian nations and Austria. They both colonised parts of the New World together around the 1600s.
In 1880, the Kingdom of Hungary and Croatia peacefully split into the Kingdom of Hungary and the Republic of Croatia. Both nations have remained close allies since.