Zimmerman Note
German diplomat wrote a letter to Mexican government asking to attack the US in exchange for lands that Mexico used to own in the US
Russian Revolution
Woodrow Wilson did not agree with Russian alliance with the Allies because Russian was totalitarian
Economic issues
loaned lots of money to Allied Powers; if Central Powers won the US wouldn't be paid back
The Ancient Egyptian Concept of Heaven. Ancient Egyptians believed the purpose of life was to nourish the seeds of the divine within us all. They thought if a person or god is successful in this and passes the test of the Tuat, or Underworld, and the Weighing of the Heart, the reward is eternal life with the gods.
:)
I would say the Hittites and the Celts. The Hittites thrived and disbanded before the beginnings of the Roman empire. The Celts were absorbed by the Romans but were keen to follow their ways.
One is definitely the poll tax