How did mariel boatlift affect america

The Mariel boatlift - El Mariel in Spanish - was a refugee crisis created by the Fidel Castro´s government in 1980, when he allowed to leave Cuba thousands of citizens that wanted to leave their country and go to the United States. Besides facing a humanitarian emergency caused by the sudden flow of people, American authorities confronted a sensitive security theat posed by the arrival of numerous Cuban criminals that had been released by the Castro government  to  deliberately harm the US.

Explanation:

After the Civil War, the railroad companies revolutionized the lumber industry. They needed great quantities of lumber to use for railroad ties, fuel, and other purposes. The railroads also connected the forests with the growing U.S. lumber markets. By the late 1800s lumber had become Texas's leading industry.