World in 1492 developing one of the largest empires in history and underpinned the emergence of a global trading system primarily fuelled by precious metals. Centralisation and further state-building in mainland Spain ensued in the 18th century with the Bourbon reforms. In the 19th century the Crown saw the independence of its American colonies as a result of cumulative crises and political divisions after the Peninsular War. Political instability reached its peak in the 20th century with the Spanish Civil War, giving rise to the Francoist dictatorship that lasted until 1975. With the restoration of democracy under the Constitution of Spain and the entry into the European Union, the country experienced profound economic, political and social change. The so-called Siglo de Oro was a period of flourishing in arts and literature in Spain, coinciding with the political rise of the Spanish Empire under the Catholic Monarchs and the Spanish Habsburgs. As such, Spanish art, music, literature and cuisine have been influential worldwide, particularly in Western Europe and the Americas. As a reflection of its large cultural wealth, Spain has one of the world's largest numbers of World Heritage Sites and is the world's second-most visited country. Its cultural influence extends over 570 million Hispanophones, making Spanish language the world's second-most spoken native language and the world's most widely spoken Romance language. Spain is a highly developed country ranked 27th in the Human Development Index, a secular parliamentary democracy and a constitutional monarchy, with King Felipe VI as head of state. It is a high-income country and an advanced economy, with the world's sixteenth-largest economy by nominal GDP and the sixteenth-largest by PPP. Spain has the twelfth-highest life expectancy in the world. It ranks particularly high in healthcare quality, with its healthcare system considered to be one of the most efficient worldwide. It is a world leader in organ transplants and organ donation. Spain is a member of the United Nations, the European Union, the Eurozone, the Council of Europe (CoE), de facto member of the G20, the Organization of Ibero-American States (OEI), the Union for the Mediterranean, the North Atlantic Treaty Organization (NATO), the Organisation for Economic Co-operation and Development (OECD), Organization for Security and Co-operation in Europe (OSCE), the World Trade Organization (WTO), and many other international organisations. Etymology The name of Spain (España) comes from Hispania, the name used by the Romans for the Iberian Peninsula and its