In the 21st century, historians have increasingly portrayed the 1970s as a "pivot of change" in world history, focusing especially on the economic upheavals that followed the end of the postwar economic boom. In the Western world, social progressive values that began in the 1960s, such as increasing political awareness and economic liberty of women, continued to grow. In the United Kingdom, the 1979 election resulted in the victory of its Conservative leader Margaret Thatcher, the first female British Prime Minister. Industrialized countries experienced an economic recession due to an oil crisis caused by oil embargoes by the Organization of Arab Petroleum Exporting Countries. The crisis saw the first instance of stagflation which began a political and economic trend of the replacement of Keynesian economic theory with neoliberal economic theory, with the first neoliberal governments being created in Chile, where a military coup led by Augusto Pinochet took place in 1973.