In January 1776 it became the first of the British North American colonies to establish a government independent of the Kingdom of Great Britain's authority and it was the first to establish its own state constitution. Six months later, it became one of the original 13 states that founded the United States of America, and in June 1788 it was the ninth state to ratify the Constitution, bringing that document into effect.

Concord is the state capital, while Manchester is the largest city in the state, and according to the U.S. census' 2015 estimate is the most populous New England city north of Boston, including other Massachusetts cities. It has no general sales tax, nor is personal income (other than interest and dividends) taxed at either the state or local level. It is known for the New Hampshire primary, the first primary in the U.S. presidential election cycle. Its license plates carry the state motto, "Live Free or Die". The state's nickname, "The Granite State", refers to its extensive granite formations and quarries.