Except the Republicans of the early 1900's were more like modern Democrats than modern Republicans. The Republican Party was founded on Hamiltonian policies and anti-slavery sentiment and stayed that way until the Civil Rights Movement of the mid-1900's.
People rallied behind WWII because Germany was an aggressor that had taken over nearly all of Europe, and also because of the fact that we were
bombed by Japan. I don't think you can compare Hussein and Hirohito/Hitler by
any stretch of the imagination - the Axis damned well nearly took over the entire world. Hussein was stuck in his landlocked country and essentially impotent.
I know you like to think that there is an evil liberal media that is undermining America, but there's really not. Casualties and bad things are reported because those are the stories that get people's attention - it's a sensationalist bias not a liberal bias.
And damnit, FDR
was wrong for putting the Japanese in internment camps - the government even apologized for it.