What event drove the ganguli family to reside in america?

It was when Ashoke, the main character of the story, met an elder man as he boarded the train. They conversed about books and traveling outside the borders of India and this elder inspired him to wander. Being the lone survivor of the train wreck, the conversation between him and the old man awoke him to change the course of his life and to travel.

Atahualpaemperor of the inca empire who rose to the throne after winning a civil war between him and his brother.  -he refused to become a spanish vassal or christian.-francisco pizarro kidnapped him and demanded a huge ransom.  -pizarro's secretary described him as "a man of thirty years, good-looking and poised, somewhat stout, with a wide, handsome, and ferocious face, and the eyes flaming with blood."-after the ransom was paid, atahualpa was killed by pizarro