Naval Act of 1938
Naval Act of 1938
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Naval Act of 1938

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Naval Act of 1938

The Naval Act of 1938, known as the Second Vinson Act, was United States legislation enacted on May 17, 1938, that "mandated a 20% increase in strength of the United States Navy", allocating $1.09 billion (equivalent to $19 billion in 2024 relative to GDP inflation) for it. It represented the United States' response to the Japanese invasion of China, the German annexation of Austria and the disintegration of the naval treaty system established in 1922 when both Japan and Italy refused to sign the Second London Naval Treaty of 1936.

The act was sponsored by Carl Vinson, a Democratic Congressman from Georgia who was Chairman of the House Naval Affairs Committee. It updated the provisions of the Vinson-Trammell Act ("First Vinson Act") of 1934 and the Naval Act of 1936, which had "authorized the construction of the first American battleships in 17 years" (six battleships were authorised under the 1934 Act – BB-55 to BB-60), based on the provisions of the London Naval Treaty of 1930. The 1938 Act specifically authorised the construction of 105,000 tons of battleships (the first three Iowa-class ships were built under this authorisation), 40,000 tons of aircraft carriers (expended on Hornet), 68,754 tons of cruisers (expended on 4 Cleveland and 4 Atlanta-class light cruisers), 38,000 tons of destroyers and 13,658 tons of submarines (eight vessels were built under this authorisation – SS-204 to SS-211), together with various smaller vessels. It was followed by the Two-Ocean Navy Act of 1940.

"...In addition to the tonnages of the United States Navy as agreed upon and established by the treaties signed at Washington,… and at London,… the authorized composition of the United States Navy in under-age vessels is hereby increased by the following tonnages;

total aircraft carrier tonnage: 140,000t

total heavy cruiser tonnage: roughly 180,000t

total light cruiser tonnage: roughly 160,000t

total modern destroyer tons: 128,090t

88 of 156 Clemson-class destroyers (exclusive of hull numbers 191, 192, 212, 238, 261, 262, 271, 272, 275 - 304, 306 - 335): 106,920t

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