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The John M. O'Connor papers contain correspondence, documents, and miscellany relating to O'Connor's military career (including the War of 1812), translation work, and political involvement.

The John M. O'Connor papers contain 350 letters, 15 financial records, 7 legal documents, and several lists, clippings, and the lyrics to a song, spanning 1810-1826. The correspondence is almost entirely incoming and the majority dates to the period from 1815 to 1824. Approximately 20 of the letters relate to the War of 1812; some discuss official army matters, such as supplies and troops, while others concern popular opinion of the war (June 26, 1813: "The public do not appear to be satisfied with the military acquirements of the Commander in chief, and not a few are so daring as to stigmatize his operations as being tardy & imbecile"). A series of letters in September and October 1812 relate to the death of O'Connor's mother, Margaret.

Correspondence in 1815-1816 mentions and documents the chain of events arising from the feud between O'Connor and Major General George Izard, including O'Connor's court martial and subsequent leave of absence, and his attempts to regain his position and good standing in the army. Slightly later correspondence documents O'Connor's translation of Gay de Vernon's Treatise on the Science of War and Fortifications, and includes a letter from O'Connor to Secretary of War, John C. Calhoun, encouraging him to request more copies of the work in order to ensure the success of the project (March 4, 1818). Approximately 15 letters from this period were written in French.

The majority of the material, particularly later in the collection, relates to national politics and political factions in New York State. On October 12, 1818, William H. Crawford, whom O'Connor would later back in the presidential election of 1824, wrote to O'Connor concerning a visit to the South, including observations on the failure of crops, family news, and French politics. On February 18, 1820, James Taylor provided a long account of the Missouri Compromise to O'Connor, and commented that "I am constrained to believe that the spirit of intolerance & oppression towards the black man, and the determination to perpetuate his bondage…are daily gaining ground in the Southern & Southeastern United States." Letters of November 1823 concern the presidential election of 1824 and New York politics.

Also of interest are letters from O'Connor's sister, Eliza, who seems to have been a governess or lady's companion in Middletown, Pennsylvania, but left because of dissatisfaction with the position: "You say that I was placed with the most respectable family in Middletown and all my wants were provided for, and I was at once raised to a respectable and enviable situation, as to their respectability no one will dispute it, as to my situation being enviable, I do not know how excepting I was independent of them, the want of relations will never be compensated to me by strangers" (August 25, 1820). Many letters throughout the collection also document O'Connor's interest in trading stocks and bonds. Letters from his agent, Thomas Hutchison, show his interest in bank bonds and provide advice and information on securities trading.

Several of the documents in the collection relate to the military, including 1814 General Orders, several financial records, and two certificates. Also included are several bonds, a bill of lading, and lists relating to O'Connor's translation work.

The Masters-Taylor-Wilbur papers are the personal and business letters of an extended family in New York, New Jersey, Pennsylvania, and Washington D.C. Of special interest are a group of letters between former slave Matthew Matthews and Mary F. Spence (the owner of his six children), and between Francis Markoe, Jr., and Jeremiah Wilbur, who helped Matthews purchase his children's freedom.

The Masters-Taylor-Wilbur papers (618 items) consist of 570 letters, 9 legal documents, and 39 financial records (1796-1850). The vast majority of the letters are family correspondence written by Thomas Masters and two of his daughters, Martha [Mrs. Henry W. Taylor] and Sarah [Mrs. Jeremiah Wilbur], between 1824 and 1850. The collection also includes letters written by his wife Isabella, his daughter Anna, his sons Samuel and Francis, and his sons-in-law, Jeremiah Wilbur and Henry W. Taylor. Many of the letters are between family members living in New York City, where Thomas Masters ran his mercantile business and Canandaigua, New York; Marshall, Michigan; Philadelphia; and Mt. Morris, New York. Several are joint letters with notes from two or more family members. The letters are rich in details of family life: illnesses, disease, and cures are much discussed, as are family weddings, and travel. Though dominated by family news, the family occasionally discussed politics, religion, temperance, and other religious-inspired social reform issues.

• July 19, 1832: G.H. Green to Martha C. Masters claiming a link between the consumption of alcohol and the occurrence of cholera
• October 15, 1833: Jeremiah Wilbur describing an anti-slavery speech
• December 19, 1835: Henry Masters to Martha Taylor recounting in detail a fire that swept through parts of New York City and destroyed Taylor's firm of Masters & Markoe at 51 South St.
• March 20-April 3, 1838: A long communal letter to Martha Taylor and Samuel Masters from family in New York City, in the form of a newspaper entitled "The Burning and Shining Light and Free Discussionest"
• August 1840: passing reference to hearing Daniel Webster speak
• Three letters from Lydia H. Sigourney to Martha Caldwell Taylor (July 26, 1841; February 18, 1846; February 13, 1849)
• February 15, 1842: Martha Taylor to Sarah Wilbur describing the temperance movement in Marshall, Michigan
• June 2, 1842: Sarah Wilbur to Martha Taylor discussing a wedding feast and spousal abuse
• December 11, 1842: Thomas Masters to Martha Taylor, providing a detailed account of the first New York Philharmonic Concert, which opened with a well-received piece by Beethoven
• March 3, 1844: Thomas Masters to Martha Taylor giving a second hand account of the explosion on board the U.S.S. Princeton, which killed the Secretary of State and the Secretary of the Navy

The earliest letters in the collection pertain to the Wilbur family from 1811 to 1818 (32 letters). These consist of letters from Backus Wilbur in Princeton and Newark, New Jersey, to his brother Marcus Wilbur in New York City, describing Backus’ schooling, religious training, and life at school. Included in one letter is an account of a food fight that escalated to a near riot (February 6, 1812).

Of special interest are 12 letters and two enclosures documenting the attempt of Francis Markoe, Jr., and Jeremiah Wilbur to help former slave Matthew Matthews of Washington, D.C., purchase his six children (January-September 1835). Markoe and Wilbur outlined strategies regarding the best use of the available money to maximize the purchase of the highest number of children in the shortest possible time. Also included are two letters to Matthews, one from Mrs. Mary F. Spence, informing him that she may be forced to sell his children at public auction, and the other from Luke Johnson of Dumfries, Virginia, a black slave who loaned him money toward the purchase of one of the children. Enclosed with the letters are copies of bills of sale for two of the children.

In addition to the family papers are 135 business letters, 35 receipts, four invoices, and nine legal documents that relate to the mercantile affairs of Thomas Masters, Francis Markoe, and their firms of Markoe & Masters, and Masters & Markoe in New York City and Philadelphia (1796-1847). These business papers give some insight into the New York and European financial markets and the economic climate of the time.