The most accurate words to fill the spaces would be:
Sugar plantations were the backbone ( source ) of the economy.
In 1890, the US Congress passed the ( McKinley Tariff ), which removed tariffs on all foreign sugar imports.
Hope my answers have come to your help.
I hope I can help! :)
The five military zones are called Territories.
Have a great day/evening/night! :)
Let me know if you have any additional questions!
-Kappifilms
He meant the people were as bad as the devils themselves
