Blair House, on Pennsylvania Avenue, became the setting for a decisive confrontation over the postwar control of atomic energy. At a meeting there on May 17, 1946, an effort to reconcile competing proposals instead exposed how far apart the participants were on enforcement, Soviet access, and the future of the American atomic monopoly.

A Meeting Intended to Preserve the Plan

In the weeks before the meeting, J. Robert Oppenheimer, Dean Acheson, and David Lilienthal had worked to keep an international-control plan alive by lobbying officials and the media. Acheson then brought the disputing parties together at Blair House, hoping to contain the conflict between Bernard Baruch and the plan’s advocates. Oppenheimer had declined a position as Baruch’s scientific adviser, then reconsidered within hours; James B. Conant told him that Baruch had already lost confidence in him. The gathering therefore took place amid both a policy struggle and a damaged relationship between Oppenheimer and Baruch.

The Dispute at Blair House

At Blair House, Baruch made clear that he was moving away from international ownership of uranium mines. The discussion then broke down over penalties for a country that violated an agreement. Baruch argued that a stockpile of atomic weapons should be set aside for automatic use against a violator, a policy he called condign punishment. Herbert Marks objected that this contradicted the spirit of the cooperative plan, while Acheson explained that a major power’s treaty violation would mean the international organization had already failed.

Baruch nevertheless insisted that a law without a penalty was useless. He believed the Soviet Union could not build atomic weapons for at least two decades, and used that estimate to argue against giving up the American monopoly soon. The proposal he intended to submit to the United Nations would require the Soviets to surrender their Security Council veto over the new atomic authority, expose their uranium resources to a survey before receiving access to peaceful atomic-energy information, and face an immediate atomic attack if they violated the agreement. Acheson and John J. McCloy objected to the emphasis on punishment and to the effort to preserve American superiority.

Consequences and Significance

The Blair House meeting made the conflict between cooperative international control and enforcement backed by American atomic power impossible to paper over. The Soviet Union would not accept conditions imposed while the United States continued to build and test weapons, and the meeting’s proposals threatened to prolong the very monopoly the international-control effort was meant to address. The plan was doomed: what Baruch proposed was not shared management of nuclear energy but an arrangement designed to retain the United States’ advantage.

Blair House matters in this account not merely as a meeting place but as the scene where incompatible assumptions about security became concrete policy demands. The failure to reconcile them marked a turning point for the effort to place atomic energy under international control.