Such authorization in the Constitution doesn't exist. We, as individuals, can send as much of our own $ overseas if we so desire, & for whatever purpose we want....but the feds haven't been granted that power.
I'm so sick of having the word "isolationist" being considered a dirty word. Let's put it on an INDIVIDUAL level: if your neighbors down the block are arguing, do YOU have the right to bust down their doors to get them to stop? If you didn't do such a thing, would it be right if the neighborhood called you an "isolationist" simply because you minded your own business & didn't interfere in the lives of others?
You need to remember that FDR was looking for an excuse to help his buddy "Uncle Joe" Stalin (that was HIS nickname for that evil dictator, not nime!) as well as Churchill...& since Japan & Germany had treaties that they would help one another if one nation was attacked, FDR provoked Japan into attacking us first. If FDR had followed the Founder's view re: foreign policy, Pearl Harbor would never have occured, & we wouldn't have been involved in WW2 (isn't it strange that we end up discussing this on the 64th anniversary of our being "attacked"?)
--& we wouldn't have been involved in WW2 (isn't it strange that we end up discussing this on the 64th anniversary of our being "attacked"?)--
A day...that will live in infamy...
...9-11-1.
(My humble apologies to Mr. Roosevelt for borrowing his words.)