Answer:
The significance of the 36º 30' line was that it was the dividing line for slavery and free in future states, according to the Missouri Compromise.
Explanation:
The 36° 30′ North parallel is an imaginary line located thirty-six and a half degrees north of the Equator line. It represents a latitude that assumed particular importance for US history because it was the boundary adopted in the Missouri Compromise that, in 1820, divided the country between pro-slavery states and those that repelled slavery.
The deal divided the states east of the Mississippi River, except for Missouri to the north, where those south of the parallel line would maintain the use of black slave labor.
