Comments by "Mack McKinney" (@mackmckinney5206) on "How America became a superpower" video.

  1. America became a world power because of: genocide, slavery, relative geographical isolation, abundant resources, and imperialism.
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  2. And german shepards became police dogs during ww1 or ww2.
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  3. And during ww2, german shepards were called polce dogs.
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  4. @Skoldpadda also called them police dogs.
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