Sumer is the first known civilization of all time.
The XYZ affair which led to the Quasi war.
The Quasi war was the undeclared war. Merchants’ ships were trying to stop each other. Not a lot of gun firing but this was the beginning of us building a navy.
The code name was the Manhattan Project. This lead to the creation of the atomic bombs that would be used by the United States during World War II. These bombs would be used on Hiroshima and Nagasaki, respectively, and would lead to the Japanese unconditional surrender. This lead to the official end of World War II.
Hoplites is the answer. Hope this helps you!!