A British Library blog post The Haldimand Papers: The British Empire in North America makes for instructive reading.
“Whereas colonials sought to expand their settlements westward beyond the Appalachian Mountains at the expense of the Indigenous societies, British army officers strove to preserve Native lands for Native people. The reasons for this sentiment shifted over time, but it was a surprisingly consistent policy goal from the 1750s onward.”
The Haldiman Papers are online on 48 reels at Canadiana Heritage.