Since 1276 Austria ruled over many people and countries, and in the nineteenth-century one of these lands was the Hungarian kingdom which included the Slovak people.
Austria maintained its traditional leadership until it was drawn into the "Seven Weeks' War of 1866." After Austria was defeated, Hungary was in a position to barter for more power, and the Ausgleich, or Compromise, of 1867 gave Hungary legal equality with Austria.
Thus, Austria-Hungary, also called the Austro-Hungarian Monarchy and the Dual Monarchy came into existence in 1867 and lasted until 1918
Austria-Hungary was a land of many different peoples. Each nationality group had its own part of the country and was almost a separate unit. Twelve million Germans and ten million Magyars dominated twenty-three million Slavs, three million Rumanians, and many smaller groups. The weaker groups were devoted to their own customs and languages. People were loyal to a nationality group, rather than to Austria-Hungary. World War I, which changed the map of Europe, completely destroyed the Dual Monarchy.
The land area of Austria-Hungary, including that of Bosnia-Herzegovina, was 261,241 square miles. It was slightly smaller than Texas.