Final answer:
The mandate is known as the Colonization Act of 1824 and it offered land, security, and temporary tax exemption to foreign settlers in the northwestern territory.
Step-by-step explanation:
The mandate described in the question is known as the Colonization Act of 1824. This act was passed to encourage settlement in the northwestern territory by offering foreign settlers land, security, and temporary exemption from taxes. It aimed to attract people to the region and promote its development.
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