Answer:
The discovery of the New World
Explanation:
1421
But amateur historian and author Gavin Menzies has made a lucrative career upending conventional wisdom, starting with his controversial book "1421: The Year China Discovered the World" (William Morrow, 2002), in which he claims that a Chinese fleet helmed by Admiral Zheng He sailed to the Americas in 1421 and left
Christians believe that there is a heaven and hell as well as reincarnation and their purpose in life is to obey what God's bible says
Answer: René Robert Cavelier, Sieur de la Salle
Explanation: In 1682 René Robert Cavelier, Sieur de la Salle, exploring the Mississippi River, claimed for the French king all the lands drained by it. He is credited with naming the territory Louisiana, which included present Oklahoma.
Well sometimes you may not have access to a document that was made during the same time period as the historical subject that is being studied. Therefore, a secondary source would be better to use to understand more about subject you are studing.