What was true of the differences between the north and south after 1820?
a. the south's economy was turning from agriculture to manufacturing.
b. the south was rapidly becoming industrialized.
c. the north was becoming more urban and industrial.
d. the north was becoming an agricultural society.

The correct option would be C: The North was becoming more urban and industrial.

Industry flourished, fueled by more abundant natural resources than in the south, and many large cities were established. By 1860, one quarter of all Northeners lived in urban areas. Slavery had died out, replaced in the cities and factories by immigrant labour from Europe.

In fact, an overwhelming majority of immigrants settled in the North rather than the South. Transport was easier in the North.

Far more Northerners than Southerners belonged to the Whig/Republican political party and they were far more likely to have careers in business , medicine or education. In fact, an engineer was far more likely to be from the North than from the South. Northern children were more prone to attend school than Southern children.

the answer is b. hope this !

answer; /// i believe that the correct answer is (d)the huang he river valley;