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--Yigito123--

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If I remember correctly, you have to;

-Make sure they are democratic or Non-Aligned.
-Get them into your faction (You need to be leader if I remember correctly)
-Don't make them form Austria-Hungary.

Eventually, you'll get an event where Austria voluntarily votes to join Germany.
 

man0lo

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I found in a thread that after creating the central powers faction if you go "Rekindle Imperial Sentiment" they form Austria-Hungary; they join your faction automaticaly and after a couple of months they hold a referendum to join the German Empire. Is that not correct?
 

--Yigito123--

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That used to be the case and it allowed you to annex Hungary and Czechoslovakia for free, but I am pretty sure PDX barred the event from firing for Austria-Hungary in one update.
 

User29

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It's worth another play through to get it some other time. Germany is the main character of the game after all
 

squid_hills

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On a Monarchist Germany playthrough, I tend to let Austria-Hungary reform (if I'm doing the Focus on the True Enemy path). They make a decent ally, all things considered. Add Romania into the mix and you've got two good friends to help you out against Russia (three good friends if the Soviets invade Poland after you guarantee them). If you go down the Expatriate the Communists path, then absolutely try to ally with Austria as quickly as possible. If you get them into your faction fast enough, you can block Hungary from doing anything useful with the Pact of Rome. Annexing Austria in that fashion splits the Pact of Rome up geographically, allowing you to deal with Hungary and Italy separately.