"[A] possible further difficulty is cited, namely, that arising from
the Constitutional provision that only Congress may declare war.
This argument is countered with the contention that a treaty will
override this barrier, let alone the fact that our participation
in such police action as might be recommended by the international
security organization need not necessarily be construed as war."
Confidential Memorandum for the State Department  , "American Public Opinion and Postwar Security Commitments", 1944 (6 years prior to Korean 'police action')