The framers of the constitution could not have anticipated creating an air force. therefore, its creation is an example of

I'm guessing that this is referring to the elastic clause. The constitution has the elastic clause built in, stating that the government has the power to make any laws that are necessary and proper. I don't know if this applies to the air force or not, but I hope it helps!

February 1848 is when it was added. if that's what you were asking