किस मामले में सर्वोच्च न्यायालय ने 'मूल संरचना' (Basic Structure) का सिद्धांत प्रतिपादित किया, जिससे यह स्थापित हुआ कि न्यायिक समीक्षा संविधान का एक मौलिक पहलू है?

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?