As Germany, I invaded America and made a peace deal with it becoming my puppet, but whenever it accepts it just crashes, sorry I don't have the save game as somehow it disappeared (along with several others)
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It all happens at the same time. This is event 14 on the f12 cheat that lets you make peace with the USA as Germany; this results in lots of ahistorical things such as new Nations of CSA, Texas and California. As far as I know this is the same series of events that would happen with a USA puppet. It is a lot of code and often pause's or crash's the game as you have found out (but not always). I would always save the game before making peace deals/annexations.
Invading USA with japan, I offer them to be my puppet , and the game crashes. What shall I do in order to prevent it? I haven't understood simon's suggestion.
As far as I understood it you need to slow down the time for a couple of days, saving before making the peace offer.