You can transfer ownership of occupied territories to allies however. Once out of the peace screen go to your government tab, hit mange occupation (I think that is what it is called, at the bottom) and then you have the option to both release and return provinces depending on if the government exists or not. You have to take the provinces for yourself.

The more expensive items will drop their autonomy much more than the cheaper ones. How do you reduce autonomy in hoi4?Д¬onstructing buildings and infrastructure in their states is quite effective, especially if you have a lot of civilian factories. It requires you to have +190 relations and will incur a -30 malus to any other vassals, it also takes quite a while to annex them. Go to your vassals diplomacy screen and under Dynastic Actions there is Annex Vassal. If they are a dominion and you canвЂ™t build in them, send them a lend lease and use the suppress subjects continuous focus. What is the difference between Manchuria and Manchukuo?Д«uild anything you can in them to decrease autonomy and pay with political power to downgrade their autonomy level until it reaches the annexation stage. By February 1932, the Japanese had conquered the whole of Manchuria. In September 1931, they claimed that Chinese soldiers had sabotaged the railway, and attacked the Chinese army. In the 1930s, the Japanese controlled the Manchurian railway. How Was the Puppet State of Manchukuo Founded? In order to distract any potential international audience, cover up its act of aggression, and keep northeast China permanently under its control, Japan decided to form the puppet state of Manchukuo four days after the September 18th Incident in 1931. How do you increase compliance in HOI4?.What does it mean that puppet is stateless?.What is the difference between Manchuria and Manchukuo?.How did Japan take control of Manchuria?.

Hoi4 release nation as puppet