What if Britain had taken Alaska during the Crimean War?
Short answerAlaska would likely become part of Canada, strengthening it with territory and resources and producing a Canadian-led Aleutian campaign during the Second World War.
NotesSeizing Alaska would probably not transform already poor Anglo-Russian relations. The larger consequence is a bigger, more resource-rich Canada that receives Alaska's gold and other wealth. Japan might still occupy islands during the Second World War, but Canada would probably insist on leading the recovery and might fortify the region more heavily in advance. American participation would become supporting rather than automatically dominant.