Final answer:
The rumor in the Spring of 1879 was that the Federal Government had set aside all of Kansas for freed slaves, providing them with free land and $500. However, this rumor turned out to be false and no such plan was implemented.
Step-by-step explanation:
The rumor in the Spring of 1879 was that the Federal Government had set aside all of Kansas for freed slaves, providing them with free land and $500. This rumor emerged during the era of Reconstruction, when many former slaves were seeking opportunities for a new start in life. However, this rumor turned out to be false and no such plan was implemented.
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