No, you hurt my feelings when you say I am a child for not being able to grasp
I apologise then. It was not my intention.
What does America get from Eastern Europe
I am not sure about Eastern Europe, I very rarely go there. As for Poland (which is Central Europe, by the way), America gets a reliable ally on the eastern NATO flank (if only to defend the oh-so-valuable Germany, France or Italy - Russia would have to go through Poland first, right?), with decent economy and relatively strong army (and getting ever stronger); they get billions upon billions from arms purchase contracts (as well as natural gas and other resources sales).
Sure, if the US ever decide that alliance with Poland is not in their long term interest, they will undoubtedly abandon us. I am not a child to think otherwise. But - for the time being - it's better than just being an easy pray to Russians and their imperial ambitions. Why does Poland prefer to be an American vassal rather than the Russian one? I suppose it's the question of national perception of cultural/power hierarchy, if you know what I mean. Basically, a country can stand being a vassal of a country that they perceive as better than they themselves are. Being vassals of someone whom we consider inferior to us in almost every aspect would be unbearable. You may argue that this Polish perception of Russia is skewed, unfair and inaccurate, and I might even tend to agree with you to some extent, but it is what it is.
Did you take notes? Or are you a mind reader?
No to both questions. I do, however, know how nuclear weapons work, and Russia is still a nuclear superpower. That's why nobody was going to ever either invade or "regime change" them. Simple as that. Anything else is just attempting to justify Russia's idiotic attempt at restoring their "empire".