When was Massachusetts admitted to the Union?
On Febuary 6th, 1778 Massachusetts was the 6th state to ratify the u.s constitution, making it part of the union!
Massachusetts, Oregon and Arizona achieved statehood in February. Massachusetts was admitted into the Union on February 6, 1788 becoming the 6th state to join the Union. Oregon was admitted into the Union on February 14, 1859 becoming the 33rd state to join the union. Arizona was admitted into the Union on February 14, 1912 becoming the 48th state to join the Union.