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A revived movement for the Christian unification of Spain was capitalized on by the "Catholic monarchs" (Reyes Católicos in Spanish) Isabel I of Castilla and Fernando II of Aragón in order to justify their invasion of Granada, the expulsion of the Jews and the forceful conversion of the Moors. In the 15th century, the Kingdoms of Castile and Aragon were united under Isabel and Fernando. These two able rulers ruled jointly and worked to consolidate the power of the monarchy at the expense of the nobility. During their reign, the castles of many nobles (symbols of aristocratic independence from the monarchy) were demolished, and a system of regular taxation was established. Fernando and Isabel established the basis for the unification of Spain religiously as well as politically and economically.

Spain suffered a shocking terrorist attack, the March 11, 2004 Madrid attacks on its capital's commuter train network, killing 200. Al-Qaeda has been blamed for this attack. Some have attributed the fall of the Aznar government to this attack, which took place just two days before the 2004 elections. At first the public believed ETA was responsible for the bombing. When they learned Al-Qaeda was the true culprit, many voters lashed out at the media and Aznar's government, believing the two had colluded to deceive the public.

The most important minority group in the country are the Gitanos. Other indigenous minorities are Mercheros (or Quinquis) and Vaqueiros de alzada.- The latter, meaning "Mountain cow-breeders" dwell in mountain ranges in the Principality of Asturias and have kept historically apart from the valley dwellers. Foreign minorities include South Americans from countries like Argentina, Ecuador or Colombia; black Africans; Arabs and Berbers mainly from Morocco and other countries of North Africa; and Asians from China, Japan, Korea, and Vietnam.

The original peoples of the Iberian peninsula (in the sense that they are not known to have come from elsewhere), consisting of a number of separate tribes, are given the generic name of Iberians. This may have included the Basques, the only pre-Celtic people in Iberia surviving to the present day as a separate ethnic group. The most important culture of this period is that of the city of Tartessos. Beginning in the 9th century BC, Celtic tribes entered the Iberian peninsula through the Pyrenees and settled throughout the peninsula, becoming the Celt-Iberians.

Madrid, the capital of Spain, is located in the center of the country. Population of the city of Madrid proper was 3,093,000 as of 2003 estimates.

The 20th century initially brought little peace; colonisation of Western Sahara, Spanish Morocco and Equatorial Guinea was attempted as a substitute for the loss of the Americas. A period of dictatorial rule (1923-1931) ended with the establishment of the Second Spanish Republic. The Republic offered political autonomy to the Basque Country and Catalonia and gave voting rights to women. However, with increasing political polarisation and pressure from all sides, coupled with growing and unchecked political violence, the Republic ended with the outbreak of the Spanish Civil War in July 1936. Following the victory of the nationalist forces in 1939, General Francisco Franco ruled a nation exhausted politically and economically until his death in 1975.

The crown jewel of Spain's next decade of infrastructure construction is the Spanish high speed rail network, Alta Velocidad Española AVE. Currently, an ambitious plan includes the construction of a 7000 km network, centered naturally on Madrid. The overall goal is to have all important provincial cities be no more than 4 hours away from Madrid, and no more than 6 hours away from Barcelona. Currently, AVE high-speed trains link Atocha station to Seville in the south and Lleida in the east (to be extended to Barcelona).

Spain remained officially neutral in World Wars I and II, but suffered through a devastating Civil War (1936-39). During Franco's rule, Spain remained largely economically and culturally isolated from the outside world, but slowly began to catch up economically with its European neighbors. Under Franco, Spain actively sought the return of Gibraltar by the UK, and gained some support for its cause at the United Nations. During the 1960s, Spain began imposing restrictions on Gibraltar, culminating in the closure of the border in 1969. It was not fully reopened until 1985.

Modern Spain began to take form during the Reconquista, the struggle between the Christian kingdoms arising in the northern regions left unconquered by the Moors and the Muslim kingdoms into which Al-Andalus eventually split.

The dictatorship of Miguel Primo de Rivera collapsed in 1930. Disgusted with the king's involvement in it, urban population voted for republican parties in the municipal elections of April 1931. The king was forced to resign and a republic was established.