Why do we need to know about the world?

so what's the point? why should we care about what goes on in the rest of the world? Do we need to be aware of what's going on? Should it only matter if it impacts America? What are the advantages of being up to date regarding world affairs? How does prior events (history) influence current events? Should we take the past into consideration when examining the present and contemplating the future? what do you think???