what Progressives don't want you to know,
In 1789, Congress passes, and George Washington signs into law, a bill stating that no territory could become a state if it allowed slavery.
In 1792, the Democrat Party is formed. They are the party that promotes and seeks the continuance of slavery.
In 1808, Congress abolishes the slave trade in America.
In 1818, the Democrats become the majority in Congress. Using their majority, they begin to undo the 1808 and other anti-slavery decisions.
In 1820, the Democrat Party passes the Missouri Compromise, institutionalizing slavery in half of the territories.