Croatia was part of Hungary until it helped found the 'Kingdom of the Serbs, Croats, and Slovenes' in 1918 (shortened to Kingdom of Yugoslavia in 1929). It became a fascist puppet-state under Hitler, called the Independent State of Croatia but by 1947 Croatia was once again part of the Yugoslav Republic.
Croatia declared independence in 1991, and spent the next five years fighting with both Yugoslavia and separatists within its own borders. In 1998, the UN helped to peacefully unite the rest of the country.
Croatia has a rich cultural heritage stretching over 1,300 years. Nikola Tesla, the inventor of wireless radio and AC electricity, was a Croatian. Croatia is a rich source of art, literature, music, and the home of the necktie.
Croatia on Wikipedia