Near the beginning of his career, Einstein thought that Newtonian mechanics was no longer enough to reconcile the laws of classical mechanics with the laws of the electromagnetic field. This led to the development of his special theory of relativity. In 1917, Einstein applied the general theory of relativity to model the structure of the universe as a whole.
During the eve of the ? War in the 19?s, Einstein told Emperor ? about the possibility of the United States developing an nuclear fussion, and the possibility of an nuclear bomb. Emperor ?, concerned by this possible future, ordered the developement of an nuclear weapon in what would become the Berlin Project.
Einstien, following the detonation of the first atomic weapon in July 3, 1943 by France, Einstien brought an end to his scientific career and retired back in Ulm, where he spent the remainder of his life, until his death on April 18, 1955.