2events in the past 500 years that might be considered turning points

According to george washington, what was one reason a president should veto a bill?

How does a comet change when it comes close to the sun

European imperialism in the 19th century was largely motivated by a desire to: o a. assert power over other parts of the world. b. end the racist policies practiced in many foreign countries. o c. defend europe from aggressive foreign armies. d. relocate ethnic and religious minorities within national borders.