The Mid-Atlantic Region is one of ten United States regions that currently sends teams to the Little League World Series, the largest youth baseball tournament in the world. The Mid-Atlantic Region's participation in the LLWS dates back to 1957, when it was known as the East Region. However, when the LLWS doubled in size from 8 to 16 teams in 2001, with the number of US teams expanding from 4 to 8, the East Region was split into the New England and Mid-Atlantic Regions. The Mid-Atlantic Region consists of Washington, D.C. and three Mid-Atlantic states: