 Metro construction required billions of federal dollars, originally provided by Congress under the authority of the National Capital Transportation Act of 1969 (Public Law 91-143). The cost was paid with 67 % federal money and 33 % local money. This act was amended on January 3, 1980 by Public Law 96-184, "The National Capital Transportation Amendment of 1979" (also known as the Stark-Harris Act), which authorized additional funding of $ 1.7 billion to permit the completion of 89.5 miles (144.0 km) of the system as provided under the terms of a full funding grant agreement executed with WMATA in July 1986, which required 20 % to be paid from local funds. On November 15, 1990, Public Law 101-551, "The National Capital Transportation Amendments of 1990", authorized an additional $ 1.3 billion in federal funds for construction of the remaining 13.5 miles (21.7 km) of the 103-mile (166 km) system, completed via the execution of full funding grant agreements, with a 63 % federal / 37 % local matching.
