We call the National League "the senior circuit".
This is because it was the first professional baseball league in the US founded on this day in 1876.
The original teams were the Boston Red Stockings (now the Atlanta Braves), Chicago White Stockings (now the Chicago Cubs), Cincinnati Red Stockings, Hartford Dark Blues, Louisville Grays, Mutual of New York, Philadelphia Athletics and the St. Louis Brown Stockings.
The American League was started in 1901.
P.S. You can listen to my show. If you like our posts, please look for ”Donate” on the right column of the blog page.
