Sarah may be the sister of either or both of her sister-in-laws Elizabeth and Obedience Jackson the wives of William's brother James. Sarah may be the sister of her sister-in-law Temperance Jackson the wife of William's brother George.

Historical
1738-1756: Mali - Famine across the Sahel, half the population of Timbuktu (Mali) died
1738: Italy - Pope Clement XII Issues the Eminenti Apostolatus Specula prohibiting Catholics from becoming Freemasons
1739: England, Spain, Caribbean - Great Britain and Spain fight the War of Jenkins Ear in the Caribbean
1739: India - Battle of Karnal, Nader Shah defeats the Mughals and sacks Delhi
1740-1741: Ireland - Famine in Ireland killed ten per cent of the population
1740-1748: Austria - War of the Austrian Succession
1740: England, Spain, United States - British attempt to capture St. Augustine, Florida but lose to the Spanish during the Siege of St. Augustine
1740: Germany - Frederick the Great comes to power in Prussia
1741: Italy - Pope Benedict XIV Issues Immensa Pastorum principis against slavery
1741: Russia, United States - Russians began settling the Aleutian Islands
1741: United States - Benjamin Franklin invents the Franklin Stove, a very efficient stove that heats a house even after the fire extinguishes. Franklin chose to not patent his invention based on his belief that he instead should help others
1743: United States - Thomas Jefferson is born in Virginia
1744-1748: France, India - The First Carnatic War fought between the British, the French, the Marathas, and Mysore in India
1744: France - French attempt to restart the Jacobite rebellion fails
1744: Saudi Arabia - The First Saudi State is founded by Mohammed Ibn Saud
1745: England, Scotland - Second Jacobite Rebellion began by Charles Edward Stuart in Scotland
1745: United States - John Jay born
1747: Afghanistan - Ahmed Shah Durrani founded the Durrani Empire in modern day Afghanistan
1748-1754: England, France, India - The Second Carnatic War fought between the British, the French, the Marathas, and Mysore in India
1748: Austria - Treaty of Aix-La-Chapelle ends the War of the Austrian Succession and First Carnatic War
1748: United States - Benjamin Franklin retires from the printing business to pursue scientific matters
1750: Europe - Peak of the Little Ice Age [first suggested in 1939, this has since been disputed after more detailed research] that lasts another one hundred years
1751: United States - Jamaes Madison born
1752: United States - Benjamin Franklin discovers electricity with his famous kite flying experiment which was done in secrecy at the time. Later that same year he invents the lightning rod, one of the most perfect inventions because it continues to do its job without maintenance. It is still being used today by every tall building in the world.
1753: United States, France, England - Major George Washington, age 21, delivers a message to the French from the English King asking the French to leave North American, the French politely refuse
1754-1763,: United States, France, England - The French and Indian War, Fought in the U.S. and Canada mostly between the French and French allies and the English and English allies, the North American chapter of the Seven Years War
1754: India - Treaty of Pondicherry ends Second Carnatic War (of three) and recognizes Muhammed Ali Khan Wallajah as Nawab of the Carnatic
1755-1763: Canada - The Great Upheaval, forced population transfer of the French Acadian population from Nova Scotia and New Brunswick
1755: Portugal - The Lisbon earthquake
1756-1763: France, India - The Third Carnatic War fought between the British, the French, the Marathas, and Mysore in India
1756-1763: globe - Seven Years War fought among European powers in various theaters around the world
1757: India - Battle of Plassey signaled the beginning of formal British rule in India after years of commercial activity under the auspices of the East India Company
1758: England - British colonel James Wolfe Issues the Wolfe Manifesto
1758: United States - James Monroe born