An independent Canada, which is ASB if you mean both Upper and Lower together, would not expand to the Pacific. The Metis of Red River/Manitoba would not be able to be conquered without British backing. The HBC's Rupert's Land similarly would not just be handed over by the UK. British Columbia would not join.
How can Canada be independent in the war of 1812?
Ugh. Another common AH.com misconception. The number of Loyalists that fled to Upper Canada was actually outnumbered by 10-1 by "American" expats in the early 1800s that went to Upper Canada not because they were "loyalists" but for land and normal American drive to go "west" from NY and New England in search of land. These Americans were no different than Daniel Boone going to Louisiana while it was French, or Bowie and Crockett in Texas, or Sutter in California, or the Americans who settled in and revolted in Freedonia, West Florida, and Hawai'i. Upper Canada wasn't full of large numbers of Loyalists. It was full of apathetic American expats who really didn't care about who was in charge as long as they had land and freedom, the only people they probably did not want to have over them would have been Catholic and French speaking Lower Canada (hence the reason the British split the two)It can't. IOTL the provinces had a lot of loyalists who'd fled to Canada after the AWI, and they weren't about to rebel against the UK any time soon. If the Americans somehow did better in the war and occupied Canada, they'd either give it back in exchange for concessions elsewhere, or annex it as part of the USA.
Ugh. Another common AH.com misconception. The number of Loyalists that fled to Upper Canada was actually outnumbered by 10-1 by "American" expats in the early 1800s that went to Upper Canada not because they were "loyalists" but for land and normal American drive to go "west" from NY and New England in search of land. These Americans were no different than Daniel Boone going to Louisiana while it was French, or Bowie and Crockett in Texas, or Sutter in California, or the Americans who settled in and revolted in Freedonia, West Florida, and Hawai'i. Upper Canada wasn't full of large numbers of Loyalists. It was full of apathetic American expats who really didn't care about who was in charge as long as they had land and freedom, the only people they probably did not want to have over them would have been Catholic and French speaking Lower Canada (hence the reason the British split the two)
But yes, to find lands where there were mostly descendants of loyalists, you need to look at the Maritimes.