The New York times has a cool feature where they've archived all of their old articles online. In this case, they've referenced the impeachment trial of Andrew Johnson, which began on this day, March 13, 1868. It's pretty cool reading the newspaper articles in the vernacular of the time. http://www.nytimes.com/learning/general/onthisday/big/0313.html#article
Today also marks the day that Standard Time was adopted in the United States in 1884.