After Little Mac crushes Lee at the end of the Seven Days leading to a quick US victory the US gets more cocky. It winds up at war with France due to Venezula. I am changing it a bit to make it an entirely naval war.
Now for some changes to WWI.
1) It breaks out in 1910 for some other reason. Due to butterflies Spain replaces the Ottoman Empire as a Central Power. Italy remains neutral.
2) The US has been building up its navy since its humiliating defeat in 1903. It still carries a grudge with France.
3) The US is officially neutral but is sympathetic with Germany due to anti-French sentiment.