In the 1825 Treaty of St Louis, the Shawnee Nation ceded Cape Girardeau to the USA for $11,000. The USA also gave the Shawnees five years of unlimited access to a blacksmith shop, promising to provide all tools and 300 pounds of iron annually.
The transaction achieved not only a real estate purpose. "Moreover, peace and friendship between the two nations were renewed and perpetuated," according to Wikipedia.
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