CV and mad panic behaviour

[DJC]

They only got involved when the Japs got ahead of themselves and attacked Pearl Harbor, they were happy to keep supplying everyone with equipment, keep the war running and make a dollar out of everyone. Hitler made the wrong move attacking Russia, he could have attacked England instead , would have won that easy but attacked Russia and it was downhill from there.

Operation Sealion - the invasion of Britain - was cancelled in Sep 1940 when Luftwaffe losses from the Battle of Britain were so great that the invasion could not succeed.

Operation Barbarossa - the invasion of Russia - began on 22 Jun 1941, long after Hitler had given up on invading Britain.

As for Pearl Harbour, the Japanese didn't get "ahead of themselves", all three US Pacific fleet carriers were at sea when the Japanese attacked.  The war could have taken a very different course if the carriers had been sunk at Pearl Harbour.  Neutralising  the US Navy's Pacific fleet was a key element of Japan's strategy, and they nearly pulled it off.

The US provided military equipment to the Allies via Lend-Lease which meant that no payments were required until the end of the war.  The US was the recipient of reverse Lend-Lease military equipment from Britain after it entered the war.  It was actually in the USA's interest to end the war quickly so they could get payment, hence their insistence on the bringing D-Day forward.