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After the fall of the Roman Empire, Germanic tribes invaded the former empire, several turned sedentary and created successor-kingdoms to the Romans in various parts of Europe. Iberia was taken over by the Visigoths after 410.In the Iberian peninsula, as elsewhere, the Empire fell not with a bang but with a whimper. Rather than there being any convenient date for the "fall of the Roman Empire" there was a progressive "de-Romanization" of the Western Roman Empire in Hispania and a weakening of central authority, throughout the 3rd, 4th and 5th centuries. At the same time, there was a process of "Romanization" of the Germanic and Hunnic tribes settled on both sides of the limes (the fortified frontier of the Empire along the Rhine and Danube rivers). The Visigoths, for example, were converted to Arian Christianity around 360, even before they were pushed into imperial territory by the expansion of the Huns. In the winter of 406, taking advantage of the frozen Rhine, the (Germanic) Vandals and Sueves, and the (Asiatic) Alans invaded the empire in force. Three years later they crossed the Pyrenees into Iberia and divided the Western parts, roughly corresponding to modern Portugal and western Spain as far as Madrid, between them. The Visigoths meanwhile, having sacked Rome two years earlier, arrived in the region in 412 founding the Visigothic kingdom of Toulouse (in the south of modern France) and gradually expanded their influence into the Iberian peninsula at the expense of the Vandals and Alans, who moved on into North Africa without leaving much permanent mark on Hispanic culture. The Visigothic kingdom shifted its capital to Toledo and reached a high point during the reign of Leovigild, treated in some detail at its own entry.

After World War II, being one of few surviving fascist regimes in Europe, Spain was politically and economically isolated and was kept out of the United Nations until 1955, when it became strategically important for U.S. president Eisenhower to establish a military presence in the Iberian peninsula. This opening to Spain was aided by Franco's rabid anti-communism.

Madrid is also noted for its nightlife and discotheques. Younger madrileños sometimes dance all night, stop off for chocolate y churros at dawn, go home, shower, shave, and go to work. This nightlife, called la movida or la marcha and initially focussed on the Plaza del Dos de Mayo, flourished after the death of Franco, especially during the 80's while Madrid's most cherished mayor Enrique Tierno Galván was in office. A particular hub for this night activity is nowadays the nearby gay village of Chueca. However, as prices continue to rise and more jobs become available, nightlife in Madrid is becoming more and more like that of other European cities such as Stockholm or Munich.

As the Roman empire declined, the Suebi, Vandals and Alans each took control of part of Hispania. In the 5th century AD the Visigoths, a romanized germanic tribe, conquered all of Hispania and established a relatively stable kingdom lasting until 711, when it fell to an invasion by Islamic North African Moors and became part of the expanding Umayyad empire, under the name of Al-Andalus. When the Umayyad empire gave way to the Abbaside empire, an Umayyad exile established the Caliphate of Cordoba, effectively making Al-Andalus independent from the empire.

Spain is considered by many, including a large part of Spanish population, to be a group of nations unified under a single State, much like Belgium, Switzerland or the United Kingdom. Despite this, the policy of many Spanish governments has led to a "Spanish nationhood" which is the one people identify with Spain internationally.

The Napoleonic invasion gave the opportunity to the American colonies, led by Libertadores, to claim their independence. Between 1810 and 1824, Chile, Colombia, Ecuador, Venezuela, and the other colonies declared and won their independence. The only New World colonies Spain was left with were the islands of Cuba and Puerto Rico. The Allies fought Napoleon's forces in the Peninsular War, with Joseph Bonaparte ruling as king at Madrid. In 1812 the Cortes took refuge at Cádiz and created the first modern Spanish constitution, the Constitution of 1812 (informally named La Pepa).

In 1898 Spain lost the Spanish-American War. Cuba gained its independence, and Spain lost its remaining New World colonies—Guam, the Philippines, and Puerto Rico—to the United States. Spain's colonial possessions were reduced to Spanish Morocco, Western Sahara and Equatorial Guinea.

In 1499, about 50,000 Moors in Granada were coerced by Cardinal Cisneros into mass baptisms and conversion. During the uprising that followed (known as the First Rebellion of the Alpujarras), people who refused the choices of baptism or deportation to Africa, were systematically eliminated. What followed was a mass flee of Moors, Jews and Gitanos from Granada city and the villages to the mountain regions (and their hills) and the rural country, however by 1500 Cisneros reported that "There is now no one in the city who is not a Christian, and all the mosques are churches".