Nations that declared war on us first: (I leave Japan out because our formal declaration, while in response to an obvious act of war, was technically the first official declaration)
Nazi Germany
Italy
Romania
Bulgaria
Hungary
Croatia
Albania
The Philippines
Of those 8 nations, we responded by declaring war on 5 of them: Germany, Italy, Bulgaria, Romania, Hungary
Are there particular reasons why we didn’t declare war on the other 3?
Just as an added question: I believe FDR wanted to declare war on Japan for obvious reasons. So he could have used the Philippines declaring war on the US as an excuse to declare war on Japan without waiting for Pearl Harbor to happen?