Better analysis:
Tension with Great Britain after the tacit support of the Irish nationalists by President Smith in the late 1920's and the lack of any sort of naval or military disarmament after WW1 were going to high, even taking away economic problems. But America's actions in humiliating Britain at every turn it could (allowing Japan to build up a navy stronger than the RN, allowing Edward VIII to continue to claim the crown from New York City) meant that was was eventually inevitable, especially after the incidents in Montreal.
No war with Britain means that the RN is still considered the world's premiere naval fighting force, probably no French authoritarianism, Hitler supported as a bulwark against Communism, and Italy doesn't get an empire in the Eastern Mediterranean. A stronger USN after the Canadian War means that Japan gets defeated instead of fighting war-weary America to a draw in the Pacific War. No Irish invasion means my great-grandfather doesn't die, with resulting butterflies.
In short, probably a more democratic world, instead of communist and fascist dominations of Europe and Asia.