AskHistorians

I assume you’re referencing his policies towards western expansion? I don’t see how that was meaningfully different from Washington’s views as he also wanted the US to move west.

Both Washington and Lincoln were comparative moderates on the issue, for that matter. Washington was an advocate for integrating Native Americans as citizens (which is paternalistic, but better than the land theft and ethnic cleansing which would come); Lincoln was an advocate for reform of treatment of Native Americans, but was busy with the US Civil War and had little opportunity to exercise any independent policy on the matter.

Settlers being denied access to the land past the Appalachian mountains was a significant contributing factor to the revolutionary war.

tbf, even pro-Independence figures of the time considered the prohibition not much more than a temporary PR measure from the Brits. The nominal prohibition wasn't a major factor, though the American interest in spreading westward was always very... prominent.