What would of happend to Britain In World War 2 if America hadn gotten involved?
Depends on what you mean by not getting involved. If you mean not involved at all, including any lend-lease, money support, oil, supplies, etc, then the British would have been in a lot more trouble than they were. The British were maxed out in manufacturing. They needed planes with which to fight the Battle of Britain, merchant ships, destroyers to fight German U-boats and carry much needed supplies to the nation. If that’s what you mean, Britain might have been forced to sue for peace, or a cease-fire, probably not invaded, but the war probably wouldn’t have gone their way. Now if you mean not getting involved by declaring war type thing (like if Pearl Harbor hadn’t happened and Hitler hadn’t declared war on the US). then I think Britain beats back Germany, but lacks the ability to open an offensive front in Europe, instead relying on air-strikes and Russian ground forces to defeat Germany.