What were the 3 ways that the europeans control the africans on the sugar plantation in the caribbean in the 17th century?

Sugar was the main crop produced on plantations throughout the Caribbean in the 18th, 19th, and 20th centuries. Most islands were covered with sugar cane fields, and mills for refining it. The main source of labor, until the abolition of chattel slavery, was enslaved Africans. After the abolition of slavery, indentured laborers from India, China, and Java migrated to the Caribbean to mostly work on the sugar plantations. These plantations produced 80 to 90 percent of the sugar consumed in Western Europe.

because the vietnam war was fought in an especially brutal and untraditional way