The US took the oregon territories from the british empire in the 1840s. Even before the civil war, the british empire was in no position to challenge the US in

The US took the oregon territories from the british empire in the 1840s. Even before the civil war, the british empire was in no position to challenge the US in north america. America was focused on western expansion to the pacific before and after the civil war, not to worthless canadian tundra and the frigid arctic.