The team changed its name to the Boston Red Caps in 1876 when it joined the National League .
The team was founded in 1871 as the Boston Red Stockings and was one of the nine charter members of National Association of Professional Base Ball Players .
The team changed team 's name to the Boston Red Stockings     in 1876 when it joined the National League .
The team was founded in 1871 as the Boston Red Stockings and was one of the nine charter members of National Association of Professional Base Ball Players .