Hehe, make that a large one.
To correct all misunderstanding, here are a few facts. In no organized order.
1. It wasn't Germany vs the UK, it was the Axis vs the UK, Germany and Italy.
2. On the sideline, there was the USSR who traded goods with the Axis.
3. On the other sideline was the USA who traded goods with many, but couldn't trade with the Axis for the mere reason that the RN made the transport impossible. The USA had the UK pay in gold, give away naval bases and blueprints etc before delivering goods, which to quite an extent were obsolete although useful.
4. The Axis had much more materials than Britain during the BoB in most fields. Not all perhaps. Don't forget the UK's colonies.
5. The convoys bringing goods in 1940 to the UK were British, and a lot of Norwegian as well.
6. Some of the U.S. stuff was more sophisticated than the UK, and some not. Look at the U.S. frontline fighters in the spring of 1940....then compare them again in the spring of 1942....and there's more...In short, - both ways.
7. The lend-lease pact with the British went through with just a few votes difference, although being hotly supported by the president.
8. Many major figures in the U.S. political and military/aviation life had the opinion that Britain was not the horse to put your money on. That includes old Kennedy, and Charles Lindberg.
9. The first convoys to come to the Soviets aid were British. In fact they probably were at sea before the USA joined the war.
10. Germany declared war on the USA, not the other way around.
How far are you with the popcorn ?