International tourism is a significant source of revenue during the summer, with Croatia ranked the 18th most popular tourist destination in the world.The state controls a part of the economy, with substantial government expenditure.In 1918, after World War I, Croatia was included in the unrecognized State of Slovenes, Croats and Serbs which seceded from Austria-Hungary and merged into the Kingdom of Yugoslavia.A fascist Croatian puppet state backed by Fascist Italy and Nazi Germany existed in World War II.Croatia has a total area of 56,594 square kilometres (21,851 square miles) and a population of 4.28 million, most of whom are Roman Catholics.
The first attestation of the Latin term is attributed to a charter of Duke Trpimir from the year 852.
In 1527, faced with Ottoman conquest, the Croatian Parliament elected Ferdinand I of the House of Habsburg to the Croatian throne.
During the early 19th century, parts of the country were split into the French Illyrian Provinces, and Austria-Hungary occupied its Bosnia and Herzegovina side–a dispute settled by the 1878 Treaty of Berlin.
The Kingdom of Croatia retained its sovereignty for nearly two centuries, reaching its peak during the rule of Kings Petar Krešimir IV and Dmitar Zvonimir.
Croatia entered a personal union with Hungary in 1102.