The Southern part of Spain was invaded by the Iberians from North Africa around 1000 BC, followed by the Celtic settlers from France. After that, the majority of the population was Celtiberian. Spain has been ruled by the Catholics, Moors, Muslim invaders and others, which leads to the richness of its cultural heritage. King Ferdinand started expanding his empire in the 15th century, but the country's position declines after 1648 because of the thirty-year war. It was neutral during the first World War. After 1936, General Franco under the influence of Hitler and Mussolini conducted Fascist dictatorship. The democratic constitution was adopted in 1978.