Maine became a state in 1820 as part of the Missouri Compromise.
How the Missouri Compromise of 1820 reached its compromise is that they realized that Main was neither of the two .It wasn't a slave state nor was it a free state so they decided that Maine should be a free state because of its environment with all the factories and that Missouri should be a slave state because of its large plantations.
The Missouri Compromise involved the states of Missouri and Maine. Missouri was admitted as a slave state, while Maine was admitted as a free state to maintain the balance between free and slave states in the Senate. This compromise, enacted in 1820, aimed to address the growing tensions over slavery in the United States.
Perhaps better asked is what founded the US state of Maine. Main became a state in 1820 as part of the Missouri Compromise of 1820. To keep the balance between slave and free states, the Compromise added Missouri as a slave state and part of Massachusetts was made into Maine. Perhaps it can be said that Henry Clay from Kentucky "founded" Maine as he was the main force behind the Compromise.
The Great Compromise involved both houses of Congress. It based the number of representative in the House of Representatives on population and the number of Senators on a set number per state. It was a compromise between the large states and small states.
The issue of representation led to the Connecticut (or great) compromise.
Three-fifths of a state's slave population counted toward representation and taxation.
The State of California became a free State when the Compromise of 1850 was passed.
i had the same quesiton
Kansas and Nebraska
Lousainana
Under the Missouri Compromise of 1820 Missouri was admitted as a slave state and Maine as a free state.