US Resident Population in 1860 was 31,443,321 Americans.

• There were six Atlantic storms in 1851. Three were tropical storms, two were category 1 storms and there was one category 3 storm. There were far more deaths then. 
• The Pony Express leaves Sacramento, CA, for St. Joseph, MO, on April 3, 1860.
• The only GHG emissions to worry about as methane from manure. Consumerism matters when it comes to the climate.
• On February 9, 1861, after resigning from the U.S. Senate, Jefferson Davis is selected to be the provisional President of the Confederate States of America.
• Confederate forces begin bombarding Fort Sumter in Charleston Harbor on April 12, 1861.
• War is not helpful. The first days of the Iraq War put out enormous amounts of pollution.
• Poet Henry Wadsworth Longfellow publishes Paul Revere's Ride in 1861.
• President Abraham Lincoln signs the Homestead Act into law on May 20, 1862, giving applicants freehold title to land, typically 160 acres, of undeveloped federal land west of the Mississippi River.
• On September 17, 1862, the bloodiest single-day battle in American history is fought near Sharpsburg, MD, and Antietam Creek.
• The "New York City Draft Riots" rage from July 13 to July 16, 1863, following the passage of a draft law to supply men to the Union Army.
• Novelist Nathaniel Hawthorne dies on May 19, 1864, in Plymouth, NH.
• On April 14, 1865, President Abraham Lincoln is shot by John Wilkes Booth during the play Our American Cousin. Lincoln died the following morning at 7:22.
• Mark Twain publishes his first successful short story, "Jim Smiley and His Jumping Frog," in The Saturday Press on November 18, 1865.
• Russia finalizes its sale of Alaska to the United States, on March 30, 1867.
• Louisa May Alcott publishes Little Women in 1868.
• Civil War General Ulysses S. Grant beats New York Governor Horatio Seymour in the 1868 presidential election.
• Ceremonies at Promontory, UT, celebrate completion of the transcontinental railroad on May 10, 1869.
• USA Flag had 31 stars.
•