the Westminster parliamentary system. The process of decolonisation created much political upheaval in Africa and parts of Asia, with some countries experiencing often rapid changes to and from democratic and other forms of government. In the United States of America, the Voting Rights Act of 1965 and the Civil Rights Act enforced the 15th Amendment. The 24th Amendment ended poll taxing by removing all tax placed upon voting, which was a technique commonly used to restrict the African American vote. The Voting Rights Act also granted voting rights to all Native Americans, irrespective of their home state. The minimum voting age was reduced to 18 by the 26th Amendment in 1971. Late Cold War and post-Soviet democratication New waves of democracy swept across Southern Europe in the 1970s, as a number of right-wing nationalist dictatorships fell from power. Later, in Central and Eastern Europe in the late 1980s, the communist states in the USSR sphere of influence were also replaced with liberal democracies. Much of Eastern Europe, Latin America, East and Southeast Asia, and several Arab, central Asian and African states, and the not-yet-state that is the Palestinian Authority moved towards greater liberal democracy in the 1990s and 2000s. By the end of the century, the world had changed from having in 1900 not a single liberal democracy with universal suffrage, to 120 of the world's 192 nations, or 62% having become such democracies. 25 nations, or 13% of the world's nations had "restricted democratic practices" in 1900 and in 2000 16, or 8% of the world's nations were such restricted democracies. Other nations had, and have, various forms of non-democratic rule. The numbers are indicative of the expansion of democracy during the twentieth century, the specifics though may be open to debate (for example, New Zealand actually enacted universal suffrage in 1893, but is discounted due to a lack of complete sovereignty and certain restrictions on the Māori vote). Democracy in the 21st century By region The 2003 US-led invasion of Iraq led to a toppling of President Saddam Hussein and a new constitution with free and open elections.. Later, around 2011, the Arab Spring led to much upheavel, as well as to the establishing of a democracy in Tunisia and some increased democratic rights in Morocco. Egypt saw a temporary democracy before the re-establishment of military rule. The Palestinian Authority also took action to address democratic rights. In