Answer:
Monarchies
Explanation:
Serf is a term used for workers in early Europe, which was a covenant for Monarchy. The church, monarchs, and nobility owned land; while peasants and the poor had to work their lives away just to keep their position.
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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.
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The policy of moving villagers to refugee camps and then burning the village was known as : D. Pacification
This strategy was used by the United states and South Vietnam to eliminate the population that considered to be hostile during the War
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