According to the Indian Intercourse Act of 1790, under what conditions could the United States acquire Indian land?

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The Indian Intercourse Act of 1790 stipulated that the United States could only acquire lands from Native Americans through treaties, ensuring that such transactions were formal and recognized by the U.S. government. This was meant to regulate and control the process of land acquisition to prevent exploitation and unauthorized seizures of Native American lands.

According to the Indian Intercourse Act of 1790, Under What