Notable Changes:

-Add an event chain of JAP-US diplomatic maneuvering before Pearl Harbor attack
-Rework Great Pacific Game decisions of US to unlock escalating sanctions on Japan
-Add some decisions/events to Japan establishing puppet government/military forces in China

Update:

-Add starting introduction events to Japan and US, with AI speeches by the female announcer from Battlefield 1
-American Isolationism spirit blocks US from applying embargo
-American Isolationism spirit has longer training time modifier
-Add reporting events of Pearl Harbor attack to Japan
-Add an event about enlistment post-Pearl-Habror to US
-Add a tooltip of effects of puppet cabinet to the National Diet icon in Japanese Cabinet GUI
-Buff some Japanese cabinet decisions
-Add a consumption reduction effect to Japan's war in China spirit
-Japan can recruit collaborationist army divisions in a war against China
-Recession of 1937 now has an effect to worsen the Great Depression
-Japan AI will always wait to the end of 1941 to attack Pearl Harbor if it's available
-Japan's takeover of Indochina is triggered by an event instead of decision now after Pearl Harbor system initiated
-Japan and China AI will be extremely cautious about fighting in Indochina
-Rework picture of Japan's invasion of Thailand and Victory Kiss
-Patriotism Propaganda decision lasts longer
-Add a tooltip about effects to Create Pacific Theatre decision
-Operation Downfall requires US to control the Philippines
-Japan will spawn more militia divisions in Operation Downfall
-All Japan's core state will have a buff on resistance strength against US in Operation Downfall
-Japan's attack bonus against Southeast Asian colonies in the early stage of war is higher
-Japan's victory decision no longer checks naval strength comparison
-Doolittle Raid now requires at least one carrier in service
-Reduce completing time of US decisions targetting Japan during the preparation of Operation Downfall
-Japan AI will get a bit easy on China trying not to capitulate it too fast before Pearl Harbor
-Some decisions no longer cost political power
-US AI will no longer take Deal with Japan decision before the war
-Konoe's first resignation will reduce war support
-Keep Pacific Presence event gets a tooltip about Great Pacific Game decisions unlocked
-Some United We Stand decisions will stop from showing up when the score is full
-Japan AI won't do scripted peace when player is playing as countries except US in a war against Japan
-Move all music of this expansion patch to a special radio station

Update:
-Japan's decision of peace talk with USA does not require conquest decisions to be taken
-Lower USA AI's weight to refuse the peace deal
-Conquest of South East Asia decisons can buff Greater East Asia War spirit
-Special Wartime Administration Law's condition is modified for easier trigger
-Island Hopping's decision is modified for easier trigger
-Rework Japan AI's unconditional surrender conditions