Again, you are wrong. One of the great challenges Wilson faced in his efforts to get America into the war was the Monroe doctrine.
It was seen throughout our government as a separation between the old world and new world. Unless someone attacked America, we also were secure that idiotic European wars did not involve us. The part of the Monroe doctrine you are referring to was intended to keep European wars from spilling over to the Americas.
It worked well until Wilson wanted to jump into a European war.
And then someone attacked America on the Lusitania, killing 128 Americans. And nothing was done about it. Clear violation of the Cruiser Rules by Germany.
The Monroe Doctrine is not a declaration of passivity. Take note of the 1902 Venezuela crisis, which had both the German and British empires on the same side on many issues.