India is the world's largest democracy and second most populous nation with over 1 billion people. It has a long history as one of the world's oldest civilizations and was ruled by Britain as a colonial empire for 190 years until independence in 1947. India is a diverse country with over 20 official languages and many religions, most predominantly Hindu and Muslim. It has a parliamentary democracy and federal system of government with the Prime Minister as head of government. India has experienced rapid economic growth in recent decades since economic liberalization in the 1990s.