American participation in the network jumped sharply after the war.

Evidence

One index of the MPS’s balancing act can be gleaned from comparing the nationalities of the participants in the prewar Colloque Walter Lippmann to those in the society’s early postwar conferences. The search to identify scattered intellectuals who could be trusted to advance the neoliberal cause originally concentrated on Western Europe but expanded rapidly to the United States, and eventually beyond the rising superpower. While U.S. participants in the Colloque Walter Lippmann had been a small minority (3 of 84), almost half of the participants in the MPS founding conference in 1947 came from the United States, although three Austrians (Machlup, Haberler, and Mises) reinforced the American numbers (17 of 39). — Philip Mirowski & Dieter Plehwe (eds.), The Road from Mont Pèlerin, 122

Categorization

• XREF: The prewar/postwar contrast recalls the Colloque Walter Lippmann as a precursor network, useful for the reader’s trajectory from Lippmann to Hayek-era MPS.
• corroborated: 2 independent passages support this claim — Philip Mirowski & Dieter Plehwe (eds.), The Road from Mont Pèlerin: The Making…, 122