Which 17th-century philosopher wrote the verse text for the allegorical ballet 'The Birth of Peace' (La Naissance de la Paix), performed at the Swedish court in 1949 to celebrate the Treaty of Westphalia?

The Dandi March, also known as the Salt Satyagraha, was led by which influential leader?

Which act formally granted independence to India, marking the end of British rule?

Who was the key figure in establishing the Indian National Congress?