पूर्व-इस्लामी अरब की सामाजिक और राजनीतिक संरचना मुख्य रूप से निम्नलिखित में से किसके द्वारा पहचानी जाती थी?

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?