What were the benefits to having a "sphere of influence" in china and other countries rather than colonies?

Its sphere of influence would help prevent regional countries acting as “color revolution” conduits through which counter-Chinese Communist Party activities might gain purchase. The party's big fear is political instability, so there are advantages in ensuring adjoining states cannot export dangerous ideas into China

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

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