Brother Jonathan is the national personification and emblem of New England. He was also used as an emblem of the USA in general, and can be an allegory of capitalism. The catch phrase "Brother Jonathan" came into use when George Washington struggled to provision his armies during the American War for Independence . When considering the state, or lack of, munitions and supplies, he would state, "We must consult Brother Jonathan" in reference to Jonathan Trumbull the Connecticut governor – the only British governor who sided with the revolutionaries and who, as a trader and mercantilist, was arranging supplies for the revolutionary armies. "Brother" was a reference to Washington's close friendship with Trumbull. Washington repeated the phrase every time he needed provisions. Ultimately, Jonathan Trumbull indebted himself to a ruinous level ($14,000) in his efforts to secure war supplies. He could only keep the debt collectors at bay until the year before his death. The state of Connecticut was too bankrupt to repay Trumbull.  The epithet "Brother Jonathan" was originally one for the USA and not just New England, as described in Jonathan Trumbull's biography (cited above).
Brother Jonathan soon became a stock fictional character, developed as a good-natured parody of all New England during the early American Republic. He was widely popularized by the weekly newspaper Brother Jonathan and the humor magazine Yankee Notions. The phrase "we must consult Brother Jonathan" is attributed to Gen. George Washington to celebrate the part that the northern colonies played for independence from Great Britain.
Brother Jonathan was usually depicted in editorial cartoons and patriotic posters outside New England as a long-winded New Englander who dressed in striped trousers, somber black coat, and stove-pipe hat. Inside New England, "Brother Jonathan" was depicted as an enterprising and active businessman who blithely boasted of Yankee conquests for the Universal Yankee Nation.
The term dates at least to the 17th century, when it was applied to Puritan roundheads during the English Civil War. It came to include residents of colonial New England, who were mostly Puritans in support of the Parliamentarians during the war. It probably is derived from the Biblical words spoken by David after the death of his friend Jonathan, "I am distressed for thee, my brother Jonathan" (2 Samuel 1:26) . As Kenneth Hopper and William Hopper put it, "Used as a term of abuse for their ... Puritan opponents by Royalists during the English Civil War, it was applied by British officers to the rebellious colonists during the American Revolution".
A popular folk tale about the origin of the term holds that the character is derived from Jonathan Trumbull (1710–85), Governor of the State of Connecticut, which was the main source of supplies for the Northern and Middle Departments during the American Revolutionary War. It is said that George Washington uttered the words, "We must consult Brother Jonathan," when asked how he could win the war. That origin is doubtful, however, as neither man made reference to the story during his lifetime and the first appearance of the story has been traced to the mid-19th century, long after their deaths.
The character was adopted by citizens of New England from 1783 to 1815, when Brother Jonathan became a nickname for any Yankee sailor, similar to the way that G.I. is used to describe members of the U.S. Army.
The weekly newspaper Brother Jonathan was first published in 1842, issued out of New York, and it exposed North America to the character named "Brother Jonathan". Yankee Notions, or Whittlings of Jonathan's Jack-Knife was a high-quality humor magazine, first published in 1852, that used the stock character to lampoon Yankee acquisitiveness and other peculiarities. It, too, was issued out of New York, which was a rival with neighboring New England before the Civil war. It was a popular periodical with a large circulation, and people both inside and outside New England enjoyed it as good-natured entertainment. These jokes were often copied in newspapers as far away as California, where natives encountered Yankee ships and peddlers, inspiring Yankee impersonations in comedy burlesques. Brother Jonathan: or, the New Englanders was also the title of a book released in three volumes by John Neal. This was published in Edinburgh, illustrating the impact that the crafty New England character had on British literature.
Around the same time, the New England-based Know Nothing Party, which Yankee Notions also lampooned, was divided into two camps—the moderate Jonathans and the radical Sams. Eventually, Uncle Sam came to replace Brother Jonathan, and the victors applied "Yankee" to all of the country by the end of the century, after the "Yankee" section had won the American Civil War. Likewise, "Uncle Sam" was applied to the Federal government. Uncle Sam came to represent the United States as a whole over the course of the late 19th century, supplanting Brother Jonathan.
According to an article in the 1893 The Lutheran Witness, Brother Jonathan and Uncle Sam were different names for the same person:
"When we meet him in politics we call him Uncle Sam; when we meet him in society we call him Brother Jonathan. Here of late Uncle Sam alias Brother Jonathan has been doing a powerful lot of complaining, hardly doing anything else." (sic)
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