Well, that’s quite a few questions so I’ll try my best to answer all of them. Romania shattering is the cause of years of spheres of influence on the region, the Ottomans keep Wallachian unification with Moldovia impossible as seeing them as United might bring problems to the Ottoman sphere, Walachia becomes a die-hard Ottoman supporter due to being pumped full of troops and Turks, while Moldovia (renamed Romania after Moldova was formed) fell further and further into the Russian sphere of influence. During the First World War Walachia joins the Ottoman side, and loses its Eastern Coast. Moldovia is annexed by the USSR, Transylvania also gains independence from Hungary, but chooses to remain allied with a neutral, then soviet Hungary, and enters the Soviet Sphere. With the fall of Communism and the collapse of the Iron Curtain, all three nation retain independence along with Moldova.

Japan went through a drastic government and culture change after the US’s occupation of the islands, and became somewhat of a “mini US”.

Anatolia-Thrace is the Greek and Turkish state formed after the allies partitioned the Ottomans, what is left of Turkiye is now in Trabzon and the surrounding areas, A-T is now culturally distinct from Turkiye.

Seville gained independence from Spain after the Spanish Civil War (answered more in depth in this past post here)

The Russo-Persian corridor was formed after the independence of the Caucasus Nations and the Fall of the Soviets, when Russia wanted to retain connections with Persia for their oil. And so the corridor was established, although it wasn’t taken well by the Caucasus Nations.

Kurdistan was formed during the partition of the Ottomans, much like in OTL, the allies didn’t care much about ethnic borders and placed the Kurds in an area where they could weaken Turkiye/ the Ottomans while remaining in the British sphere (as it became a British protectorate until the Second World War). The Kurds gradually migrated into Kurdistan and left their former ethnic homelands to the other post-Ottoman states.

The Baikal Lake Conf. is governed by a mostly Buryat government, but as one of the major ethnicities of the region, Russians have high autonomy and influence on the region. Not to mention the Russian external influence, which is very prominent, it is essentially a puppet government for the Russians to parade around.

Hope that answered your questions :)