The pilgram that organized the first thanksgiving was William Bradford
The concept that many political leaders thought would help end the slavery issue was the concept of "popular sovereignty, meaning that the inhabitants of each new state would choose to be "slave" or "free".
I believe because California wanted to enter the union as a free state, free state means banning slavery. This made the southerners upset because California goes from north to south and if California were to be admitted as a free state, it would violate the Missouri Compromise, which drew the border to determine free states and slave states.
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