1761: england declares slavery not legal (in england). 1766: the slave owning colonies break away from the freedom loving ones (which become canada) before the idea spreads. Truth.
Vermont's state constitution forbids slavery and was adopted in 1777.
Several other rebel colonies declared themselves free even before independence was formally gained.
During the Revolutionary War, Britain transported slaves of loyalists to other British colonies. (The slaves were not emancipated.)
There was a British court decision in 1763, but it was not binding overall, seems to have been pretty widely ignored by other British courts at the time, and the matter would not be settled in the British Empire for several more decades.
You also managed to get both dates wrong. Nice going.