That would be the bubonic plague or the black plague for a more common name.
I would say a 1 because his presidency is known for a start for diplomacy with China, a slow ending of the Vietnam War, domestic acts (such as OSHA and Environmental Protection) and an era of peace with the Soviet Union (communist Russia).
That crop would be Tobacco due to the fact that John Rolfe brought tobacco seed from the West Indies (which was the main supplier to tobacco users in Britain.) to Jamestown.
The United States has the largest Christian population in the world, followed by Brazil, Mexico, Russia, and the Philippines.
