What factors lead to the rise and fall of empires?

Which of these reasons describes why spain was motivated to compete with portugal

The largest lake in south america is lake titicaca?

Based on a comparison of the myths “the maori: genealogies and origins in new zealand” and “the raven and the first men: the beginnings of the haida,” if the maori and the haida people decided to create a myth together, what would most likely be the value expressed?