Final answer:
The Treaty of Greenville was an agreement between the United States and various Native American tribes in the northwest frontier, following their defeat at the Battle of Fallen Timbers.
Step-by-step explanation:
The Treaty of Greenville was a significant agreement concluded between the United States and various tribes on the northwest frontier, not with Great Britain, Spain, or Canada. It was signed in 1795 after the Native American tribes were defeated at the Battle of Fallen Timbers.
This treaty was instrumental in opening up the Northwest Territory to American settlers and is separate from other treaties of the period such as Jay's Treaty with Great Britain, which dealt with unresolved issues from the American Revolution, or the Rush-Bagot Agreement of 1817, which demilitarized the Great Lakes.
Therefore, the correct answer is the Treaty of Greenville was an agreement between the United States and b. Indians on the northwest frontier.