The three components that make strong inference is A) prior knowledge, good inferences, and personal experience.
Labor, planting the fields, plowing the fields. etc.
Guilds were a medieval association of craftsmen or merchants who control the practice of their craft in a particular town or village.
U.S. factory owners and employment agencies had begun recruiting heavily on Puerto Rico.
After 1945, economic changes transformed Puerto Rico's economy from a monocultural plantation economy into a platform for export-production in factories through what was called Operation Bootstrap. By the 1950s a growing unemployment problem left thousands of Puerto Ricans in need of a fresh start on American companies.
