It's because it contradicted his political ideologies and campaign promises.(A)
The election was between John Adams and Thomas Jefferson. It was a battle between Federalists and the Democratic-Republicans. Thomas Jefferson win supporting the Democratic-Republicans. John Adams lost who supported the Federalists. So because of Jefferson we now have the Democratic-Republican party.
It would be the "Midway Atoll" that is is south of the Hawaiian Islands in the Pacific Ocean, and this was the location of one of the most pivotal battles between the US and Japan in World War II.
It means; Hypothesize a tentative answer
The primary concern was related to the number of congressmen from free and slave states. If Missouri was admitted into the Union as a slave state, the congress would have more Southerners than Northerners in the congress which would be bad for slaves everywhere. Northerners therefore asked that if Missouri enters as a slave state, Maine has to be separated and enter as a free state.<span />
