Truman closely followed the Allied progress of the war. George Lenczowski noted that "despite the contrast between his relatively modest background and the international glamour of his aristocratic predecessor, had the courage and resolution to reverse the policy that appeared to him naive and dangerous," which was "in contrast to the immediate, often "ad hoc" moves and solutions dictated by the demands of the war." With the end of the war, the priority of Allied unity was replaced by the challenge of the relationship between the two emerging superpowers. Both leading powers continued to portray a cordial relationship to the public, but suspicion and distrust lingered between them.