On July 15, 1870, Georgia became the last Confederate state to be readmitted to the Union.

In 1903, the newly formed Ford Motor Company takes its first order from Chicago dentist Ernst Pfenning: an $850 two-cylinder Model A automobile with a tonneau (or backseat). The car, produced at Ford’s plant on Mack Street (now Mack Avenue) in Detroit, was delivered to Dr. Pfenning just over a week later.

In 1910, the term “Alzheimer’s disease” was used to describe a progressive form of presenile dementia in the book “Clinical Psychiatry” by German psychiatrist Emil Kraepelin, who credited the work of his colleague, Alois Alzheimer, in identifying the condition.

In 1913, Augustus Bacon, D-Ga., became the first elected to the U.S. Senate under the 17th Amendment providing for popular election of senators.

In 1916, Boeing Co., originally known as Pacific Aero Products Co., was founded in Seattle.

In 1985, a visibly gaunt Rock Hudson appeared at a news conference with co-star Doris Day (it was later revealed Hudson was suffering from AIDS).

In 1997, fashion designer Gianni Versace, 50, was shot dead.

In 2006, the San Francisco-based podcasting company Odeo officially releases Twttr—later changed to Twitter—its short messaging service (SMS) for groups, to the public.