According to the lecture, international politics caused many Puerto Ricans and Cubans to move to the U.S. in the 1950s and 1960s. The correct option among all the options given in the question is option "c. At first, just a few Puerto Ricans migrated to the United States of America. Later on the flow of the immigrants increased.
Answer:
The Columbian exchange, also known as the Columbian interchange, named after Christopher Columbus, was the widespread transfer of plants, animals, culture, human populations, technology, diseases, and ideas between the Americas, the Old World, and West Africa in the 15th and 16th centuries. The impact was most severe in the Caribbean, where by 1600 Native American populations on most islands had plummeted by more than 99 percent. Across the Americas, populations fell by 50 percent to 95 percent by 1650. The disease component of the Columbian Exchange was decidedly one-sided.
An official count of the population is the census.
