Richard Hildreth (June 28, 1807 – July 11, 1865), was an American journalist, author and historian. He is best known for writing his six-volume History of the United States of America covering 1497–1821 and published 1840-1853). Historians consider it a highly accurate political history of the early Republic, but with a strong bias in favor of the Federalist Party and the abolition of slavery.
Hildreth was born at Deerfield, Massachusetts. He was the son of Hosea Hildreth (1782–1835), who was a teacher of mathematics and later a Congregational minister.
In 1826, he graduated from Harvard College. After studying law at Newburyport, he was admitted to the bar at Boston in 1830.
In 1832, Hildreth he became joint founder and editor of a daily newspaper, the Boston Atlas.
In 1834, he wrote a popular anti-slavery novel The Slave: or Memoir of Archy Moore (1836; enlarged edition, 1852, The White Slave).
In 1837 he wrote for the Atlas a series of articles vigorously opposing the annexation of Texas. In the same year he published Banks, Banking, and Paper Currencies, a work which helped to promote the growth of the free banking system in America.
In 1838 he resumed his editorial duties on the Atlas, but in 1840 removed, on account of his health, to British Guiana, where he lived for three years and was editor of two weekly newspapers in succession at Georgetown. He published in this year (1840) a volume in opposition to slavery, Despotism in America (2nd ed., 1854).
In 1849 he published the first three volumes of his History of the United States, two more volumes of which were published in 1851 and the sixth and last in 1852. The first three volumes of this history, his most important work, deal with the period 1492–1789, and the second three with the period 1789–1821. The history is notable for its painstaking accuracy and candor, as they are based on very careful analysis of the primary sources. The later volumes favor the Federalists. In dealing with the Jeffersonians, Hildreth calls them both "Republicans" and "Democrats" on the same page, but never "Democratic Republicans."
Hildreth's Japan as It Was and Is (1855) was at the time a valuable digest of the information contained in other works on that country (new ed., 1906). He also wrote a campaign biography of William Henry Harrison (1839); Theory of Morals (1844); and Theory of Politics (1853), as well as Lives of Atrocious Judges (1856), compiled from Lord Campbell's two works.