In 1820.
Yankees.
july
March 15, 1820
There were already 22 US States when Maine joined the Union.
It entered the Union as a result of the Missouri Compromise.
On 15 March 1820 as the 23rd State.
Maine was admitted into the Union on March 19, 1820 becoming the 23rd state to join the Union.
Maine was founded in 1820 by Massachusetts Bay.
It had to do with the Missouri Compromise, where both Missouri and Maine were applying for statehood. Maine was inducted as free, Missouri slave, and everything over the 36 30 line was free, except for Missouri. So who had to agree? The Senate and The House, so that they could get statehood. Without that, Maine would have been a state way later.
This stamp is Scott # 1391. It has a catalog value of 20 cents mint or used.
It became a state as a result of the 1820 Missouri Compromise.
Missouri & Maine. APEX.