In general, it was an increase in the service industry that led to a decline in labor union membership, since many of these workers don't need representation.
One theory is that the native Americans where the first to come to America but this is just an old wives tale.
Farmers used a crop rotation system which is still used today.
If you are a member of the United States
Navy then you’re under the United States Armed Forces. United States Armed
Forces is consists of five Armed Service Branches; these are the Air Force, the
Coast Guard, the Marine Corps and the Navy. These branches are under the
military control of the Secretary of the Department of Defense except for the
Coast Guard which is controlled by the Department of Homeland Security.
