1. 1836: Samuel Colt received a patent for his Colt revolver.

2. 1862: Paper currency (greenbacks) was introduced in the United States by President Abraham Lincoln.

3. 1901: The United States Steel Corporation was founded as J.P. Morgan purchased Carnegie Steel.

4. 1913: The 16th Amendment to the United States Constitution, giving Congress the power to levy and collect income taxes, was declared in effect.