Answer: The global demographic transition began in the nineteenth century in the now economically developed parts of the world (the North) with declines in death rates. Large reductions in birth rates followed in the early part of the twentieth century. These transitions are now more or less complete.
Explanation:
A. It supported the spread of slavery only in the North.
B. It promoted western migration only in the South.
C. It led to an expansion of internal improvement efforts only in the
South.
D. It fundamentally altered economic output only in the North.
