It’s only very recently, historically speaking, that the balance between helping a less advanced culture and exploiting a less advanced culture has been so tilted in the direction of helping. (Except for meme plagues that come packaged with a message of “spreading this meme constitutes help”, which we’ve always had, and which often end up as exploitation anyway.).
So you’re not going to see either many successful attempts at advancing the other culture, or many failed attempts—until now, there haven’t been attempts at all.
It’s only very recently, historically speaking, that the balance between helping a less advanced culture and exploiting a less advanced culture has been so tilted in the direction of helping. (Except for meme plagues that come packaged with a message of “spreading this meme constitutes help”, which we’ve always had, and which often end up as exploitation anyway.).
So you’re not going to see either many successful attempts at advancing the other culture, or many failed attempts—until now, there haven’t been attempts at all.