The Largest Nation YOU have ever built.

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Had some problems with Bretagne leaving its vassalship. I think that can be avoided by keeping relations positive.

yes they always break if a certain time passes with negative relations towards you + you bb level shortens that as well. for me, in late game the most money i spend are on relations, especially if a non-european( in agceep many asian countries have 1-1.50 diplomats/year at 10 aristocracy, so sending large gifts adds up. generally need to stay at war sometimes, within resonable aspects like 5 years sometimes depending on we, only for the reason of gaining the extra diplomat/yar )

 

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Thanks, I'm glad I'm playing a European nation then! By the way, vassalhood doesn't end when a nation changes religion.

I also just found that when you want to paint the map your color, you have to take care that not only is the number of colonies limited before your chances of success become smaller when building a new colony, the same is also true for trade posts level 1 and 2. From the EU2 Wiki:

Limits on Small Trading Posts

A country may own any number of trading posts. However, when a country owns too many small trading posts (level 1 or 2), it gets penalized on creating new ones. You get a certain number of small posts without causing the penalty. After that, every small trading post not offset by a larger-than-average one (level > 3) will create a -1% penalty on the chance to create new trading posts.

The exact way this works is as follows. The levels of all of your trading posts are added together along with your monarch's administrative rating. Then 3 times the number of trading posts is subtracted. If the resulting number is still less than zero, it becomes the malus on later trading post attempts.

For example, a country's monarch has admin 7, and it has 11 trading posts with the following sizes: level 1, 1, 1, 1, 1, 1, 1, 1, 3, 5, and 6. To calculate the malus in this case, we add all the levels up along with the admin rating: 1+1+1+1+1+1+1+1+3+5+6, +7 = 30. Then we subtract 3 times the number of trading posts, that is, 33. The resulting number is -3; a malus of -3 applies to the percentage chance of any new trading post creation attempts. This country should expand three trading posts before attempting new ones.

 

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Tried to diplo-vassalize Sweden as a super-strength England and it indeed seems to be so that big nations are the same as nations that have vassals themselves - you cannot diplo-vassalize them, no matter that you are a lot stronger in all respects. I even tried it with BB=0, no success.

 

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So now I will try to in a new game to diplo-annex a forcibly vassalized big state like Spain, Sweden or Russia. Did anyone try that successfully?

 

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So now I will try to in a new game to diplo-annex a forcibly vassalized big state like Spain, Sweden or Russia. Did anyone try that successfully?

Yes, DA'ed a large Spain and Austria before, you get better results if they have been vassals 30 years or more, plus you DA them when you have a good monarch (with high diplo) and even better if theirs has low diplo.

 

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So now I will try to in a new game to diplo-annex a forcibly vassalized big state like Spain, Sweden or Russia. Did anyone try that successfully?

get a good diplo monarch, stability at +3 (or at least higher then the target country), and vassalage of +15 years (or +30~even better)

 

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Playing as Burgundy I annexed a good sized England and a large France. As stated, it is best to wait until you have a really awesome monarch with high diplo along with all the other factors. If they have a weak monarch at the same time you are in even better luck.

 

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Tried to diplo-vassalize Sweden as a super-strength England and it indeed seems to be so that big nations are the same as nations that have vassals themselves - you cannot diplo-vassalize them, no matter that you are a lot stronger in all respects. I even tried it with BB=0, no success.

i did manage to do that a few times to sweeden and ALWAYS to venice. but remember that economic ratio between you and them always plays most important role(in concordance with monarch diplo skills, etc, but those are following the income ratio or "built" on it as a "bonus" or "handicap".
sweeden in late game only and if a historical one with not many manufactories, cots, etc(economic output).

So now I will try to in a new game to diplo-annex a forcibly vassalized big state like Spain, Sweden or Russia. Did anyone try that successfully?

as france or england is quiet easy to diploannex spain before it starts colonizing or as "castile"
my fav thing is in 1430's as france, to dow all iberian alliances and vassal them. then for next 30 years getting all cores and flander, etc. then by 1470 annexing aragon, maybe release naples or catalunia, etc...
then castile and portugal after( by that time i have also great trade from 6-8 refineries built prior to that).
same goes for england, and if carefull and release some minor vassals like navarra, etc you should stay around 1/2 of maximum bb level( no extra stability handicap due to high bb).