So I notice that if you are a vassal state, and you have low enough relations to form relations with other states, the game won't let you join another alliance (though it will let you create a new one)
As Genoa (vassal of Milan) I ditched my early alliance with Modena, Tuscany, and the Knights in order to join one led by France. However, when I tried to do so, the game informed me that I could not join France's alliance, because France was in an alliance led by France, and that I would need to speak to the alliance leader, i.e. France.
Same thing with other alliances. Try to speak to Austria and join their alliance. Austria tells me that I have to speak to the alliance leader, Austria.
I know this is tied in with the vassalization as I then declared war on Milan, and could then join other alliances.
And I can form my own alliance, as I said, as I tested by creating one with Saxony and Thuringen.
As Genoa (vassal of Milan) I ditched my early alliance with Modena, Tuscany, and the Knights in order to join one led by France. However, when I tried to do so, the game informed me that I could not join France's alliance, because France was in an alliance led by France, and that I would need to speak to the alliance leader, i.e. France.
Same thing with other alliances. Try to speak to Austria and join their alliance. Austria tells me that I have to speak to the alliance leader, Austria.
I know this is tied in with the vassalization as I then declared war on Milan, and could then join other alliances.
And I can form my own alliance, as I said, as I tested by creating one with Saxony and Thuringen.