I've got Hearts of Iron 4. If you love micromanagement games, were you get to control everything really good. Don't expect battles, it's really just a numbers game. But, honestly, I love it. Canada rules the Americas.
It is a amazing game, but it takes dedication, patience and a lot of micromanagement to be able to play this and have success/fun. *unless you like getting rekt by the AI because you didn't micromanage and had no patience by sending troops in the field with 25% equipment filled.. I totally didn't do that in my first attempts.