1. On December 19, 1816, Indianapolis was established as the capital of Indiana. Prior to this date, the capital had been located in Corydon, but a committee was appointed to select a new, more central location. They ultimately chose what is now Indianapolis, and the city was officially designated the capital of the state.

2. On December 19, 1836, the state of Indiana recognized the rights of married women to own property in their own name. This was a significant step forward for women's rights in the state, as it meant that they could own and control their own assets, without requiring their husband's permission or approval.

3. December 19, 1951, marked the end of a trolley system in Fort Wayne, Indiana. The last streetcar line in the city was discontinued, making way for the rise of automobiles as the primary mode of transportation for many Americans.

4. In 1974, on December 19, the Pacers played the New Orleans Jazz in the first game of the ABA/NBA exhibition series. This was the first time that teams from both leagues had played against each other, and it paved the way for the eventual merger of the two leagues in 1976.

5. December 19, 2013, was a historic day for same-sex couples in Indiana. On this date, U.S. District Court Judge Richard L. Young struck down a state law that banned same-sex marriages, arguing that it violated the U.S. Constitution's equal protection clause. This decision paved the way for same-sex couples to legally marry in Indiana.