United States Department of State

The United States Department of State served as a central instrument of American diplomacy during Harry S. Truman’s presidency, but it was not a single, seamless voice. Its work ran through conferences, cables, policy-planning offices, and the judgment of individual secretaries and advisers, sometimes in tension with the President’s authority. From the inherited diplomatic team at the end of the war to the reorganization under George C. Marshall, the department helped turn urgent international problems into policy while exposing how much depended on who controlled the message and when it reached Truman.

An Inherited Department and a New President

At a major foreign-policy meeting on April 23, 1945, the officials gathered in the Oval Office were the people Franklin D. Roosevelt would have assembled. The group included Secretary of State Stettinius, alongside Henry Stimson, James Forrestal, George C. Marshall, William D. Leahy, Averell Harriman, Charles Bohlen, and other senior officials. Truman had brought no new foreign-policy adviser of his own, no Russian specialist, and none of his former Senate staff. The department therefore entered the new administration as part of an inherited team, rather than as an organization already remade around the new President.

That continuity did not prevent an early change in tone. Before the meeting, Truman had told Soviet foreign minister Molotov that he stood behind the commitments made by the late President. But after Stettinius reported that the Soviet Union was insisting on retaining its chosen government in Poland regardless of American objections, Truman concluded that agreements seemed to run only one way. The episode showed the department’s place in a rapidly changing relationship: its officials brought information and diplomatic experience, while Truman was learning to judge whether assurances and negotiations produced reciprocal action.

The department was also connected to wartime scientific and strategic work through its personnel. William L. Clayton, an Assistant Secretary of State for Economic Affairs, sat on the civilian Interim Committee on S-1, while Byrnes served as the President’s personal representative. The committee’s members and scientific advisers considered the atomic bomb’s possible use, but the committee was advisory: Henry Stimson told Truman that responsibility for the recommendation rested with him. The department’s presence in this process was thus significant, but it did not displace presidential responsibility for the final judgment.

Potsdam and the Work of Diplomacy

Preparing for the Potsdam Conference required a vast interdepartmental operation. The United States Department of State worked alongside the War Department, the Navy, the Army Air Corps, White House staff, and the Secret Service, with British and Soviet participation also part of the arrangements. Truman’s immediate party numbered fifty-three. The scale of the journey and conference made diplomacy an organized operation involving transportation, security, communications, and the preparation of proposals, not simply a series of private conversations among leaders.

At the conference, Truman moved quickly through an agenda that included creating a Council of Foreign Ministers to prepare for a peace conference, the administration of Germany, and implementation of the Yalta Declaration. He raised the failure to fulfill commitments to support democratic government in liberated European countries, naming Romania, Bulgaria, and Greece among his concerns. He also proposed changing Italy’s position in relation to the United Nations. The exchanges showed the department’s work at the point where drafts and diplomatic proposals met disagreement: Churchill asked for time to study proposals, while Stalin questioned the role China might play in a European settlement.

The conference’s tightly controlled setting underscored the limits on information around this work. Nearly two hundred reporters had come to Berlin, but none could attend the proceedings; access to the room was restricted even for staff bringing papers. Messages from the War Department were decoded at an Army message center in Babelsberg and then taken to the officers in the Map Room at Number 2 Kaiserstrasse for delivery to Truman. The process made the movement of information part of the machinery of diplomacy, with sensitive communications handled through designated military and presidential channels.

The department also became the route by which Japan’s surrender was formally conveyed. On August 14, 1945, the Swiss chargé d’affaires brought the Japanese text to Byrnes at the State Department, and Byrnes carried it immediately to the White House. The message passed from a diplomatic intermediary to the Secretary of State and then to the President, making the department a direct link in the final communication of the war’s end.

Byrnes, Authority, and the Control of Policy

Under Byrnes, the relationship between the department and the President was not always candid or easy. After the Moscow conference, Byrnes released a communiqué before giving Truman a summary report. While returning to Washington, he arranged radio time so he could address the nation before seeing the President. Truman responded by asking him to report in person and discuss whether a broadcast was advisable. The sequence was more than a breach of etiquette: it raised the question of who had the authority to present American foreign policy to the public.

Truman respected Byrnes’s intelligence and experience but did not entirely trust him. Their differing assessments of the Soviet Union sharpened the difficulty. Some officials, including Harriman, Leahy, Forrestal, and Dean Acheson, favored a stronger public response to Soviet conduct; Byrnes was seen by them as too conciliatory. Truman, meanwhile, could express alarm over the Soviet refusal to withdraw from Iran while disavowing a speech by Winston Churchill that he had previously supported. To observers inside and outside the administration, this left American policy appearing uncertain. The department’s influence, in this period, was inseparable from the competing judgments of its senior figures and from Truman’s effort to keep presidential authority over the administration’s public position.

Reorganization and the Greek Aid Crisis

Marshall’s appointment as Secretary of State brought a change in the department’s organization and direction. Byrnes had been away for 241 of his 546 days as secretary and had shown little interest in the department’s internal administration. Under Marshall, the Foreign Service experienced a clearer sense of purpose, and disputes among section heads were met with an insistence on solving the problem. When Acheson reported that the department had outgrown its old Victorian building beside the White House and that new quarters were available in Foggy Bottom, Marshall approved the move.

With Truman’s support, the department established a Policy Planning Staff under George Kennan, recalled from Moscow. This gave policy planning a formal place within a broader effort to make the organization more orderly and efficient. The new structure was tested almost immediately by the crisis in Greece and Turkey. After the British announced that they would withdraw from Greece, Marshall and Acheson urged prompt American assistance. Greece alone required a quarter of a billion dollars for the remainder of 1947. Truman agreed that substantial aid was needed quickly, but the administration also had to persuade Congress that the crisis demanded action. At a meeting with congressional leaders, Marshall described the danger of expanding Soviet domination; Acheson argued for a more urgent presentation, and Arthur Vandenberg offered support if Truman made the case forcefully to Congress. The episode connected the department’s analysis and recommendations to the separate task of building domestic political backing for foreign policy.

Advisers in Nuclear and Military Decisions

The department’s contribution to national security debates also depended on particular officials rather than a uniform departmental position. At the final session of the Z Committee on January 31, 1950, in Room 216 of the Old State Department Building, Acheson took charge and presented a draft presidential statement in favor of proceeding with the hydrogen-bomb project. David Lilienthal opposed rushing ahead, warning that delay might be preferable to intensifying the arms race and questioning the effect on defense spending and foreign policy. Their disagreement placed competing strategic judgments inside a process that ultimately called for a presidential decision.

Senior department officials also advised Truman during the conflict over Douglas MacArthur. After MacArthur issued a statement that defied presidential and United Nations policy, Truman met with Acheson, Robert A. Lovett, and Dean Rusk. Despite his anger, and despite the advisers’ concern about the political consequences of confronting a popular commander, Truman chose a restrained reprimand rather than immediately dismissing him. The department’s officials helped assess the diplomatic and political stakes, but the decision remained Truman’s. Across these episodes, the United States Department of State appears not as an autonomous author of policy but as an institution whose influence depended on its access to the President, the organization of its expertise, and its ability to make competing judgments usable in moments of crisis.