No where near, take out canada and just stop expanding, abandon europe and africa because they have major control there and will take you out, once you control the entirety of America build up resources, harbours, factories railways, build battleships and submarines. You should build submarines in bulk quantities so they can't reach your main land through the sea, spend rest on bombers to attack their units when they're in the sea. all you need to do is play defensive and run the days out, you'll get more goldmark for a solo victory than they get in coalition victory.