What contributed the most to human migration more than ten thousand years ago?

Is karma the same as destiny, in the sense that everything that happens to you is predetermined? do you believe that "what goes around comes around," and if so is this the same as karma? does everyone get what they deserve, in the end?

During the era of european expansion, what was the biggest reason for spain’s push for exploration?

When and why did the united states enter world war 2