The US didn’t declare war since WW2 because such a declaration would give the president disruptive powers (such as the power to seize factories).
In fact, after Vietnam war congress specifically created a law to restrict hostilities without congress approval to up to 60 days, which is what the current (and prior) administrations are acting on.
In fact, after Vietnam war congress specifically created a law to restrict hostilities without congress approval to up to 60 days, which is what the current (and prior) administrations are acting on.