Spain is a parliamentary monarchy and democratic country where all citizens are equal under the law. It adopted its constitution in 1978 which established it as a democracy and is the highest law. Spain is divided into 17 autonomous communities and two cities, with communities composed of provinces and municipalities. The European Union is an economic and political union of 28 European countries that Spain joined in 1986, providing benefits like tax-free trade, a shared currency, and guaranteed product quality standards.