By the time the US entered WW1, Europe had already destroyed itself, the major belligerents were exhausted (or had already dropped out), and the war was on the edge of ending anyway.

And, while the US contribution to the outcome in WWII was more significant globally than in WWI, we absolutely did not get involved to save Europe from anything, or anyone from Europe. It wasn't Europeans that attacked Pearl Harbor.

That's a re-write of history.

The Roosevelt administration Congress has approved the Lend-Lease act which meant active involvement in Europe with armaments, active naval combat in the North Atlantic, and ground troops in Iceland. The US had started building a 'two ocean' Navy almost two years before Pearl Harbor. Pearl Harbor was a final gift to the Roosevelt administration's multi-year program of full mobilization.

This program of support and mobilization absolutely was in response to events in Europe and a desire to see the UK in particular not fall. Note that when the US did enter the war, the Pacific was designated the secondary theater of operations.

> had to save Europe twice now

The impact on WW1 was rather small though. German forces were already at a low, especially because of the British sea blockade. The American entry into the war might have shortened it a bit, but it was not really the deciding factor.

Full disclosure: I'm German.