Which of the following was the best reason for reform during the 1800s? a. the rapid development of slavery through the south. b. the rapid development of cities and urban centers. c. the rapid changes in the presidency. d. the rapid changes in foreign nations.

abraham lincoln  (february 12, 1809  – april 15, 1865) was an american statesman, politician, and lawyer who served as the 16th  president of the united states  from 1861 until  his assassination  in april 1865. lincoln led the nation through the  american civil war, its bloodiest war and its greatest moral, constitutional, and political crisis.[2][3]  he preserved the  union,  abolished slavery, strengthened the  federal government, and modernized  the u.s. economy.