Newspapers, pamphlets, and political songs.
I believe one of them is the Gettysburg Address
Europe, Asia, Africa are the first three
Answer:
23rd Amendment, ratified on 3/29/1961
Explanation:
https://en.wikipedia.org/wiki/Twenty-third_Amendment_to_the_United_States_Constitution#:~:text=The%20Twenty%2Dthird%20Amendment%20was,and%20the%20House%20of%20Representatives.
They used accurate observations in their work.
