After World War I, Mississippi's black population began a long period of decline that historians call the Great Migration.

i dont know , just need points sorry .

Explanation:

Being the center of slavery and cotton culture, heavily agricultural places such as Mississippi seceded first and returned to the Union last. Planters, who had produced cotton for the world market, emerged from the Civil War in a state of shock.  It helped to establish many of Mississippi's first public schools.

Explanation:

the answer is a the king was elected to his position

heat from the core of the earth causes convection currents to occur in the mantle. these currents slowly move the crust around.