Assuming the following scenario:
Russia holds into Alaska until the Russo-Japanese War, during which that territory is lost to Japan (Britain and the US get a bit aggressive, but stop short of anything beyond strongly-worded protests--is this ASB?). Japan makes use of the gold and other mining industries in Alaska, but since the technology to economically exploit Alaska's oil does not exist yet, Japan continues to be dependent on oil imports in the 1920s and 1930s.
Fast forward to 1941. WWII is going in Europe without any major butterfly effect changes. Japan has managed to annoy the US into cutting off scrap metal and oil imports, as IOTL. So Japan moves as they did IOTL--strike the American fleet at Pearl Harbor, attack the Philippines, strike the British.
Now where does Alaska fit into this? What role can Alaska play in the Second World War if it's been Japanese territory since 1905? How well can the Japanese fortify and man the area without crippling their campaigns in the rest of the Pacific? How long can they hold out against the Canadian and American invasion sure to follow the start of the war? Where would the hypothetical Alaska Campaign take the Pacific War after its conclusion? Island hopping down the Aleutians and Kurils to support B-29 operations? And what would be the fate of Alaska after the war ends?
Russia holds into Alaska until the Russo-Japanese War, during which that territory is lost to Japan (Britain and the US get a bit aggressive, but stop short of anything beyond strongly-worded protests--is this ASB?). Japan makes use of the gold and other mining industries in Alaska, but since the technology to economically exploit Alaska's oil does not exist yet, Japan continues to be dependent on oil imports in the 1920s and 1930s.
Fast forward to 1941. WWII is going in Europe without any major butterfly effect changes. Japan has managed to annoy the US into cutting off scrap metal and oil imports, as IOTL. So Japan moves as they did IOTL--strike the American fleet at Pearl Harbor, attack the Philippines, strike the British.
Now where does Alaska fit into this? What role can Alaska play in the Second World War if it's been Japanese territory since 1905? How well can the Japanese fortify and man the area without crippling their campaigns in the rest of the Pacific? How long can they hold out against the Canadian and American invasion sure to follow the start of the war? Where would the hypothetical Alaska Campaign take the Pacific War after its conclusion? Island hopping down the Aleutians and Kurils to support B-29 operations? And what would be the fate of Alaska after the war ends?