By implying that blacks and whites are 'separate but equal'.
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They were a strength to the Union. They carried soldiers and supplies to the battlefront much quicker, from a few months' march to a week. Having the supplies quicker to the battleground gave the Union the advantage over the Confederates, since the Union could recover much faster from any loss.
The Native Americans were not counted as part of the population in the 1970 census in America. The population was enumerated to be 3,929,214. Although the Census was proved statistically factual, based on data collected, the records for several states (including: Delaware, Georgia, New Jersey, and Virginia) were lost sometime between 1790 and 1830.
