The Vinson-Trammell Act finally authorized treaty-strength replacement

The Vinson-Trammell Act of 1934 finally authorized the Navy to build toward the strength permitted by the Washington and London treaties. Its programme included a replacement for USS Langley, 99,200 tons of destroyers to replace overage ships, and 35,530 tons of submarines. Alternating vessels and major components were assigned to government yards and plants. At least 10 percent of the naval aircraft and engines procured under the programme had to come from government factories. Those provisions sought to rebuild national infrastructure as well as add hulls. An executive order could start construction through presidential action, while an act of Congress reflected a wider national political debate. Congress had previously accepted a Navy well below treaty strength outside the capital-ship category. The act changed that policy, though authorization alone could not instantly restore lost yards or deliver ships already delayed by the long building pause. The broader treaty system had also left many exempt support and presence vessels unbuilt because political expectations after the Great War discouraged military spending.