What was the importance of the battle of Britain?

The importance of the Battle of Britain was that Great Britain was able to hold out against a relentless aerial bombardment and inflict heavy losses on the German air force, thus denying Germany an opportunity to launch an invasion that probably would have knocked the British out of the war before the United States entered. Had this occurred, the war could have developed far differently, and the Germans would have been very difficult to dislodge...

The importance of the Battle of Britain was that Great Britain was able to hold out against a relentless aerial bombardment and inflict heavy losses on the German air force, thus denying Germany an opportunity to launch an invasion that probably would have knocked the British out of the war before the United States entered. Had this occurred, the war could have developed far differently, and the Germans would have been very difficult to dislodge from Western Europe, if indeed the United States and Germany went to war at all. The battle also pointed to the direction that World War II would take. Unlike World War I, strategic air strength would be the most important aspect of the war, and the side that could gain air superiority would have a huge advantage. Massive bombing campaigns against urban areas like the London Blitz of September would become a feature of the wars in Europe and Japan. The Battle of Britain also drew the United States closer to the war by forcing its hand, as it were. Fears that Great Britain would be unable to hold out against the Nazi war machine contributed to the passage of the Lend-Lease Act, which provided loans, military equipment, and other necessities to the British after it was approved in 1941. So the Battle of Britain was, along with Stalingrad, D-Day, and the Battle of the Bulge, one of the most significant turning points in the European theater of war.