1. Short title This Act may be cited as the 21st Century Buy American Act . 2. Increase of domestic content percentage to 60 percent Section 8301 of title 41, United States Code, is amended by adding at the end the following new paragraph: (3) Substantially all Articles, materials, or supplies shall be treated as made substantially all from articles, materials, or supplies mined, produced, or manufactured in the United States, if the cost of the domestic components of such articles, materials, or supplies exceeds 60 percent of the total cost of all components of such articles, materials, or supplies. . 3. Criteria required for use of overseas exception Section 8302 of title 41, United States Code, is amended by adding at the end the following new subsection: (c) Criteria for use of overseas exception (1) In general The exception under subsection (a)(2)(A) for articles, materials, or supplies to be acquired for use outside the United States may not be used unless one of the following criteria is met: (A) The articles, materials, or supplies are needed urgently for national security reasons. (B) A cost analysis described in paragraph (2) demonstrates that the articles, materials, or supplies to be acquired (if acquired from a firm manufacturing in the United States) would be more than 50 percent more expensive for the Federal agency acquiring the articles, materials, or supplies. (2) Cost analysis In any case in which articles, materials, or supplies are to be acquired for use outside the United States and are not needed urgently for national security reasons, before entering into a contract an analysis shall be made of the difference in the cost of acquiring the articles, materials, or supplies from a firm manufacturing the articles, materials, or supplies in the United States (including the cost of shipping) and the cost of acquiring the articles, materials, or supplies from a firm manufacturing the articles, materials, or supplies outside the United States (including the cost of shipping). . 4. Criteria