But if you invite all possible members right before you send the ultimatum (Germany and Italy will almost always accept), Yugoslavia is very likely to accept. I had a co-op game where Austria-Hungary and Romania (both players) had a combined forces of 200 divisions, mostly 20 width, while Yugoslavia had 30 divisions at best, but they still refused.
Yugoslavia was a compromise to unite the solidified distinct nationalities. In the games timeframe the identity was regional more than national,so which ever South Slav nation conquered the rest would simply impose its own identity onto them.
When going to fascist Yugoslavia ("Sign the Tripartite Pact" focus after "Invite German Military Mission" to remove "Anti-German Military" national spirit). Germany gets an event where they are firing an event for the UK. The UK in its event has...
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Either is fine, but (American here) I think "Something that best suits your needs" would be the most common way of saying it.
word order - Which is correct 'suits your needs the best' or 'best ...
Yugoslavia MIOs are decent. But focus tree (Industrialization and armed forces branch) does not have the same impact as Hungary. Some reductions from 70 to 35 days, or add something that goes beyond giving 1 civ in exchange for 70 days, can help with gameplay. By the way, add more some things in “Prospect for resources” can be good.