A joint US-Canadian special forces unit was formed, trained in the Canadian Rockies in the tactics of mountain warfare.
Seen "The Devil's Brigade", hmm?
Roosevelt dropped Henry A. Wallace as his running mate in favor of James F. Byrnes.
Now there's a scary thought: President Byrnes, with nukes to drop on SU...
The Japanese under the command of Tomoyuki Yamashita did not challenge the landings

Huh?!
The invasion of the Philippines coincided with the US invading one of the Japanese home islands, Sakhalin. The northern half of the island having just been ceded to Japan did give much resistance, in the southern half of the island, the US Marines faced a much more difficult challenge. A three month campaign from February to April 1945 secured America’s foothold on Sakhalin and gave the US an unsinkable air base to launch bombing attacks into Japan.
I find this a real long shot...
Following the Mahanian Doctrine the United States lured the Japanese fleet out into a decisive battle in the East China Sea. In what is considered to be the greatest Naval battle of the war the United States Navy dealt a crushing blow to the Japanese, but at the cost of the USS Yorktown and USS Missouri.
"Lured"? IJN had been trying to achieve it since Midway, without success. USN could destroy IJN more/less at will.
the allies began to blockade Japan to starve the Empire into submission.
What does that make the Sub Force efforts since December 1941? Recall, it was USN subs which were responsible for sinking over half the merchantmen Japan lost during the war, & for more/less bringing Japan's economy to a halt by 1/45, before your "change in policy".
You're kidding, right? Bombing from China was a multimillion dollar boondoggle. Half the money went to graft, & the B-29s achieved all of nothing