What are some of the most important events and people in world history?

Important Event: the World Wars! Important People: Everyone involved with those wars!

Answer

how about the industrial revolution? or the neolithic revolution?

Answer

Gavrilo Princep in my mind is the most important person of the 20th century. By shooting Archduke Franz Ferdinand in 1914 his actions led directly to WW1 and indirectly to WW2. As such, he is arguably responsible for over 100million deaths, the collapse of European world hegemony, the rise of Communism, and the Cold War to list but a few. He has a lot to answer for.