Why were Americans moving from rural areas to urban areas during the late 19th and early 20th centuries? Explain your answer in at least 4 sentences and provide as much detail as possible.

this is hard to answer. i need help myself.

Explanation:

sectionalism continues to divide the nation as the question of slavery being allowed in the mexican cession became a problem. -the results of the mexican war spark secession in the south because the north did not want to allow slavery in the territories won.