Final answer:
True, Alexander Crummell did call for America to send individual missionaries one-by-one to African soil as part of the missionary impulse of the time.
Step-by-step explanation:
Alexander Crummell did call for America to send individual missionaries one-by-one to African soil. This idea was in line with the missionary impulse of the time, where missionaries sought to spread Christianity and civilization to distant populations. Missionaries played a significant role in the civilizing mission, being the chief means by which the 'gifts' of civilization were brought to people. They established churches, schools, and sought to assimilate people to the culture of the conquering nation.