Answer:
Plantation agriculture was labor-intensive, meaning, that it needed many workers.
Besides, it mostly consisted of cash crops like tobacco, rice, sugar cane, and cotton, that have to be cultivated regions that have very warm and humid climates like the Southeastern United States, and the Caribbean.
For these two reasons, plantation owners needed a vast supply of cheap workers, who could endure the difficult conditions of heat, humidity, and tropical diseases like malaria.
The best labor they found were African slaves: they were numerous, they were cheap, and they could resist tropical diseases because most of these diseases were already present in Africa.
Answer:
Abolished the old immigration quotas.
Explanation:
Since the Immigration Act of 1924, immigration was based on a national-origins quota system, which provided immigration visas to 2% of the total number of people of each nationality in the United States, based on the 1890 national census.
The Immigration Act of 1965 abolished those immigration quotas and established a visa system for reuniting immigrant families and attracting skilled labor people to the United States.
Answer:
Most liquid fuels in widespread use are derived from fossil fuels; however, there are several types, such as hydrogen fuel (for automotive uses), ethanol, and biodiesel, which are also categorized as a liquid fuel. Many liquid fuels play a primary role in transportation and the economy.
