How would history have unfolded if the U.S. hadn't acquired and used the atomic bomb in WW2?

Germany would of been the country to develope the a bomb if it wasn't for Albert Einstein a German Jew who warned the u.s. Of germanys intention to make an a bomb. Germany was the most technologically adavanced country in the world at that time, so if germany had the bomb and not the u.s. They would of used it against anyone who opposed them.