First let be correct a mistake.Col George Croghan was the brother and NOT the nephew of William Croghan who married Lucy Clark.Lucy Clark of course was the sister of both General George Rogers Clark and William Clark of the Lewis and Clark Expedition out of Pittsburgh in 1803.
I have traced them to the Churchill/Clark cemetery lot at Mount Hope Cemetery in Rochester NY.Of course Winston Churchill's mother was from Rochester NY.
William Clark's son who was named Meriwether Lewis Clark married Abby Churchill.She was the niece of Col/General Sylvester Churchill of Fort Churcfhill Navada.
This leads to Susan B Anthony buried another 50 yards from the Churchill and Clark families at Mount Hope Cemetery.Susan B Anthony was very close to Elizabeth Cady Stanton.
Benjamin P Thomas writes in this book titled STANTON The Life of Lincoln's Secretary of War on page 68 that Pittsburgh lawyer Edwin M Stanton married Ellen Hutchison a direct descendent of Meriwether Lewis. For sure Edwin M Stanton's partner during the Civil War was General Halleck who was, by some very good records at West Point, married to Alexander Hamilton's granddaughter.
Of course Meriwether Lewis was an aide to Alexander Hamilton during the Whiskey Rebellion of Pittsburgh in 1794.This leads to a Pittsburgh riverboatman named Nicholas Roosevelt and a family named Roosevelt. Nicholas Roosevelt along with Robert Fulton built the first steamboat on the Ohio in Pittsburgh called The New Orleans.
The Churchill/Roosevelt/Stalin family was well known during WWII.Some of the Stalins also lived in Pittsburgh when Joseph Stalin's daughter married the aide to house designer Frank Lloyd Wright.
These are all families of the Trent Affair during the Civil War which included the Russians related to Queen Victoria.