Main purpose of the declaration of independence was to

to explain to foreign nations why the colonies had chosen to separate themselves from Great Britain. The American colonies had already cut most major ties to England, and had established their own congress, currency, army, and post office.

Explanation:

separate but equal was a legal doctrine in united states constitutional law according to which racial segregation did not violate the fourteenth amendment to the united states constitution, which guaranteed "equal protection" under the law to all people. under the doctrine, as long as the facilities provided to each race were equal, state and local governments could require that services, facilities, public accommodations, housing, medical care, education, employment, and transportation be segregated by race, which was already the case throughout the states of the former confederacy. the phrase was derived from a louisiana law of 1890, although the law actually used the phrase "equal but separate

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c) troops march forward in close formation against newer, more accurate weapons