Because that opens the door for huge exploits, like: "Making Civ A a vassal of Civ B, giving all techs, then making CIv B a vassal of Civ A and giving all techs."
Being a vassal will be used for trading techs.
It's simple, every civ can only trade 15 techs or vouchers away. It's a solid rule. If Spain used up all it's vouchers, then it's impossible to require them to give up techs or vouchres.
Being a vassal will be used for trading techs.
It's simple, every civ can only trade 15 techs or vouchers away. It's a solid rule. If Spain used up all it's vouchers, then it's impossible to require them to give up techs or vouchres.
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