In Puerto Rico it was useful, in Cuba not so much. Cubans perceived the outcome as occupation and didn't want to have United States occupation in their country. Puerto-Ricans had a form of a civilian government with independence and Puerto-rican citizenship but the country belonged to US.
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During the antebellum era, both the North and the South have been producing cotton and textiles. However, because the North has far more advantages than the south in terms of technological advancements, the North was able to produce more products by the end of the era such as guns, crops, machine parts and more.
Answer is A children work long hours in unsafe conditions
