Signed in 1951 alongside the Treaty of San Francisco that ended World War II, the original U.S.-Japan Mutual Security Treaty was a ten-year, renewable military agreement that outlined a security arrangement for Japan in light of its pacifist constitution. U.S. forces would remain on Japanese soil after Japan regained sovereignty. This early security pact with Washington dovetailed with the Yoshida Doctrine—a grand strategy for postwar Japan laid out by then prime minister Yoshida Shigeru that saw Japan rely on the United States for its security needs so the country could focus on its own economic recovery.