When the Big Three met at Teheran, why did they feel like the time was right for opening the second front? Explain in one sentence.
3 answers
They felt that the Soviet Union's victories on the Eastern Front had weakened Germany enough to support the opening of a second front in Western Europe.
Germany weakening and attacked by air raids
This also played a role in the decision to open a second front, as the constant air raids on Germany were causing significant damage and weakening their ability to resist an invasion.