^"The flag of the United States shall be thirteen horizontal stripes, alternate red and white; and the union of the flag shall be forty-eight stars, white in a blue field."(美國法典第4编(英语:Title 4 of the United States Code)§§ 第1–1節) "On the admission of a new State into the Union one star shall be added to the union of the flag; and such addition shall take effect on the fourth day of July then next succeeding such admission."(美國法典第4编(英语:Title 4 of the United States Code)§§ 第1–2節)
^National Bison Legacy Act, Pub. L. 114-152, 130 Stat. 373 (approved May 9, 2016), § 3(a) ("The mammal commonly known as the 'North American bison' is adopted as the national mammal of the United States.")
^Boris I. Bittker; Scott C. Idleman; Frank S. Ravitch. Religion and the State in American Law. London. 2015-10-06: 136 [2018-08-05]. ISBN 978-1107419285. (原始内容存档于2018-08-06). The nation's first unofficial motto was 'E pluribus unum'('Out of many, one'), which was proposed in 1776, adopted in 1782, and to this day is part of the Great Seal of the United States. 'E plurbius unum' first appeared in coinage in 1795 and in 1873 was required on all U.S. coinage...