Believing they had no choice, most Native American leaders in the Southeast signed treaties giving up their lands in the 1820s and 1830s. They agreed to move west to what was called the Indian Territory in present-day _____.

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To find the answer, you can start by researching the history of Native American tribes in the Southeast during the 1820s and 1830s. Specifically, look for information about the treaties that were signed during that period. One key event to focus on is the Indian Removal Act of 1830, which authorized the forced removal of Native American tribes from their lands in the Southeast to designated territories in the west.

By examining historical records, documents, and scholarly sources, you will discover that the Indian Territory mentioned in the question refers to present-day Oklahoma. This region was designated by the U.S. government as a new home for Native American tribes who were forcibly relocated from their ancestral lands. It became the destination for several tribes, including the Cherokee, Creek, Choctaw, Chickasaw, and Seminole, as a result of the treaties they signed.

So, the answer to your question is that the Native American leaders who signed the treaties agreed to move west to the Indian Territory, which is present-day Oklahoma.