Years Flown: 1818-1819

President: James Monroe

States added: Tennessee, Ohio, Louisiana, Indiana, Mississippi

The flag reverted back from 15 stripes to 13 stripes representing the thirteen original colonies and only a star was added for each new state that joined the union. 

References: https://www.chamberofcommerce.org/usflag/history/the21starflag.html

https://en.wikipedia.org/wiki/Flag_of_the_United_States