How did the outcome of spanish-american war affect people of cuba and puerto rico?

The outcome of the Spanish-American War (resulting in a US victory) made it so that the people of Cuba & Puerto Rico came under the US rule as procterates. This meant that while they aren't "colonies", they were under the US government & had to obey US rules.

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might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories