Final answer:
The Freedman's Bureau's greatest purpose was to build schools for the children of freed slaves.
Step-by-step explanation:
The greatest purpose of the Freedman's Bureau was to build schools for the children of freed slaves. Although it did engage in other activities such as writing labor contracts to help employ freed slaves and providing food to freed slaves, its primary focus was on education. The bureau established numerous schools across the former Confederate states, providing much-needed educational opportunities for the newly freed African American population.
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