By January 1, 1942 President Roosevelt had full press censorship, a 24/7 Federal propaganda machine, was reading the mail, and was threatening (credibly) sedition prosecutions. Shortly thereafter, he detained indefinitely American citizens suspected of sympathy with the enemy and seized their property, forbade use of the US mails for disseminating objectionable opinions and information, had foreign agents on our territory shot without trial, and denaturalized and deported thousands of US citizens.
All of these actions were subsequently found to be constitutional in a series of Supreme Court decisions.
Is it a parallel situation w/o Congress declaring war?
Which we do not have . We have "authorization" whatever that is.
Is it the same as a declaration of war?