दिल्ली में स्थित 'पुराना किला' का निर्माण मुख्य रूप से किसके द्वारा करवाया गया था?

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?