Albert Einstein Einstein did not return to Germany. He settled in the United States and became an American citizen in 1940. On the eve of World War II, he endorsed a letter to President Franklin D. Roosevelt alerting him to the potential development of "extremely powerful bombs of a new type" and recommending that the US begin similar research. This eventually led to the Manhattan Project. Einstein supported the Allies, but he generally denounced the idea of using nuclear fission as a weapon. He signed the Russell–Einstein Manifesto with British philosopher Bertrand Russell, which highlighted the danger of nuclear weapons. He was
Albert Einstein Archives women, including the woman who would become his second wife, Elsa. Also to be included in the online collection is a letter to the Arabic newspaper "Falastin", proposing a "Secret Council" composed of Arabs and Jews to resolve the Arab–Israeli conflict. Albert Einstein visited Palestine in 1923 for 12 days, giving the first lecture at the Mount Scopus campus of the Hebrew University of Jerusalem—two years before the University opened in 1925. Menachem Ussishkin, the president of the Zionist Executive, invited Einstein to settle in Jerusalem, but this was the only visit that Einstein actually made to Jerusalem. However, Einstein