The Great Migration drained off much of the rural black population of the South, and for a time, froze or reduced African-American population growth in parts of the region. In a number of states, there were decades of black population decline, especially across the Deep South "black belt" where cotton had been king. The migration changed the demographics of the South. In 1910, African Americans constituted the majority of the population of South Carolina and Mississippi, and more than 40 percent in Georgia, Alabama, Louisiana and Texas; by 1970, only in Mississippi did the African-American population constitute more than 30 percent of the state's total. "The disappearance of the 'black belt' was one of the striking effects" of the Great Migration, James Gregory wrote.