पर्ल हार्बर पर अचानक हुए हमले के बाद, संयुक्त राज्य अमेरिका ने किस तिथि को साम्राज्यवादी जापान के खिलाफ युद्ध की घोषणा करके औपचारिक रूप से द्वितीय विश्वयुद्ध में प्रवेश किया था?

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?