Question: What president of the United States signed the Treaty of 1818, which gave United States of America the Pembina Region?
Sentence (from "Treaty of 1818"): The Convention respecting fisheries, boundary and the restoration of slaves between the United States of America and the United Kingdom of Great Britain and Ireland, also known as the London Convention, Anglo-American Convention of 1818, Convention of 1818, or simply the Treaty of 1818, was an international treaty signed in 1818 between those parties.
Relevant evidence: No