Which country was decided a us protectorate under the platt amendment

The country of Cuba.

Hello there,

The Platt Amendment, an amendment to a U.S. army appropriations bill, established the terms under which the United States would end its military occupation of Cuba (which had begun in 1898 during the Spanish-American War) and "leave the government and control of the island of Cuba to its people."

Hope this helps!!

the answer is migration

people had jobs and began to work. that’s why the commercial revolution was great.