What was Mariel known for during the Cuban exodus?

Mariel is known for being the avenue through which approximately 125,000 Cubans emigrated to the United States during the Cuban exodus in 1980. This event, often referred to as the Mariel Boatlift, involved a significant migration where many Cubans fled to the U.S. in small boats, seeking asylum and better opportunities. The influx of Cuban refugees in this period had a considerable impact on U.S.-Cuban relations, public perception of Cuban immigrants, and the demographic landscape of Miami, Florida, where many migrants settled. The other options do not accurately reflect Mariel's historical significance during this time, as it was not associated with diplomatic negotiations, cultural festivals, or military operations.