If the Japanese hadn’t attacked Pearl Harbour the Axis powers would have won the war. The addition of American troops in the western front was the beginning of the end for them.
That is very likely however without the support of the American people the US involvement would have been dramatically smaller and it’s unlikely Britain holds on long enough for the Americans to get troops and weaponry production up to speed.
If the Japanese hadn’t attacked Pearl Harbour the Axis powers would have won the war. The addition of American troops in the western front was the beginning of the end for them.
America would have likely joined the war regardless of whether or not Japan had attacked.
That is very likely however without the support of the American people the US involvement would have been dramatically smaller and it’s unlikely Britain holds on long enough for the Americans to get troops and weaponry production up to speed.