Hậu quả của chiến tranh thế giới thứ 2

Why do you think previous leaders of the country did not want the "common man" to vote?

Describe the technology advancements that lead to explorers being able to sail great distances. [[ps: doesn't explain where. i am only speculating it's in europe.

Aside from low birthrates and high death rates, what can cause a country’s population to decline