Maine is the 23rd State Admitted to the Union

On March 15, 1820, Maine became the twenty-third state in the Union. Originally a province of Massachusetts, Maine is noted for its picturesque coastline and dense woodlands. Even today, ninety percent of Maine remains forested.

Explorer Samuel de Champlain reached the coast of Maine in 1604 and claimed it as part of the French province of Acadia. France and Britain disputed ownership until 1763, when the region was ceded to the British during negotiations ending the French and Indian War.

http://memory.loc.gov/ammem/today/mar15.html