The Illinois-Wabash Company, formally known as the United Illinois and Wabash Land Company, was a company formed in from the merger of the Illinois Company and the Wabash Company. The two companies had been established in order to purchase land from Native Americans in the Illinois Country, a region of North America acquired by Great Britain in 1763. The Illinois Company purchased two large tracts of land in 1773; the Wabash Company purchased two additional tracts in 1775. Because the Royal Proclamation of 1763 forbade private purchase of Native American lands, Great Britain refused to recognize these transactions. Following the outbreak of the American Revolutionary War, officials of the merged Illinois-Wabash Company appealed to both Virginia (which claimed the Illinois Country) and to the United States to recognize their land purchases, but were unsuccessful. After the United States bought the land in question from Native Americans and resold it, the matter eventually went to the Supreme Court of the United States. In Johnson v. M'Intosh (1823), the Court ruled that the U.S. government, following earlier British precedent, would not recognize private purchases of native lands, and that Illinois-Wabash Company's purchases were therefore invalid. Land purchases and British denial of title In the middle of the 18th century, merchants and land speculators in the British Empire were looking to expand beyond the Appalachian Mountains into the interior of North America. Companies such as the Ohio Company of Virginia had been formed for this purpose, but rivalry between the British and the French for access to the region led to the outbreak of the French and Indian War (1754–1763), interrupting the activities of the companies. After the British victory in the war, the Crown issued the Royal Proclamation of 1763, which sought to organize and stabilize the vast new territory won from France. In order to prevent the conditions which had produced the war and its sequel, Pontiac's Rebellion (1763–1766), the British government forbade private individuals or companies from purchasing land from American Indians. Thereafter, only royal officials would be permitted to conduct treaties in order to buy Native American lands. In 1768, a group of prominent merchants from Philadelphia began doing business in the Illinois Country, selling provisions to American Indians and British troops. In 1773, William Murray, the merchants' agent in Illinois, learned of a British legal opinion known as the Camden-Yorke Opinion. This opinion made quite an impact in