The National Security League (NSL) was an American patriotic and nationalistic nonprofit, nonpartisan organization. It supported a greatly expanded military based upon universal service, the naturalization and Americanization of immigrants, Americanism, and government regulation of the economy to enhance national preparedness.
Many of the programs advocated by the NSL—such as a unified national defense agency, an interstate highway system, universal conscription, English as the official language, and a unified national budget—were highly influential. Although the organization did not survive past 1942, many of the ideas it promoted have become national policy in the United States.
The National Security League was founded by attorney Solomon Stanwood Menken and General Leonard Wood in December 1914, although the impetus for the formation of the group was Rep. Augustus P. Gardner. For funding, Menken sought out publisher George Putnam. Putnam encouraged Menken to appoint an honorary president to lend the organization prestige and give it access to respected speakers and additional funding. Menken and Putnam settled on Joseph Choate as the first such president. Menken served as the NSL's first executive director. A national committee was formed which eventually had 47 members, counting among them university presidents, bankers, cabinet secretaries and state governors.