Which of these exchanged between the old and new worlds caused the pilgrims to notice abandoned farms and food upon their arrival in 1620?

For Apex, "smallpox" is the answer

in november 1781, john hanson became the first president of the united states in congress assembled, under the articles of confederation. many people have argued that john hanson, and not george washington, was the first president of the united states, but this is not quite true.

explanation:

a, both were musicians during the jazz age