कौन सा सिंधु घाटी सभ्यता स्थल विशेष रूप से अपने प्रारंभिक-हड़प्पा (पूर्व-हड़प्पा) चरण की रक्षात्मक किलेबंदी के लिए जाना जाता है?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?