NEW YORK — The Atlantic Coast Conference’s plan to expand, revealed in 2010 and modified along the way, has come to fruition.

Pittsburgh, Syracuse and Notre Dame became members of the ACC at 12:01 ET Monday, giving the conference 15 members.

July 1 is moving day for schools switching conferences all over the country, including those relocating to the newly named American Athletic Conference.

The beginning of the American means the end of Big East football after 31 years — and the beginning of the new Big East. The new basketball-centric conference comprised mostly of the Catholic schools that didn’t have FBS football programs in the old Big East opens for business Monday as well.