PEARL HARBOR-AP The leaders of Japan and the United States sought to remind the world that even the most bitter enemies can become allies, during a historic visit to the hallowed waters of Pearl Harbor. Seventy-five years after Japan's surprise attack, Abe and President Barack Obama peered down Tuesday at the rusting wreckage of the USS Arizona, clearly visible in the tranquil, teal water. In a show of respect for the war dead, Obama and Abe dropped purple petals into the water and stood in silence. More than 1,000 U.S. war dead remain entombed in the submerged ship, which Japan struck as part of the devastating attack that killed more than 2,300 Americans and sent America marching into World War II. In the years after Pearl Harbor, the U.S. incarcerated roughly 120,000 Japanese-Americans in internment camps before dropping atomic bombs in 1945 that killed some 140,000 people in Hiroshima and 70,000 in Nagasaki. Since the war, the U.S. and Japan have built a powerful alliance that both sides say has grown during Obama's tenure, including strengthened military ties. Yet there are questions about whether the relationship will fray under President-elect Donald Trump, a possibility neither Obama nor Abe addressed.