Why did so many early civilizations arise near river valleys? Rivers provided an easy route for trade.
The seclusion of a valley provided protection from enemies.
Water created fertile soil and other agricultural advantages.
Monsoons inflicted less damage away from coastal areas.

slavery, abortion, donald trump, gay marriage, racial rights, immigration  

explanation:

anything that has been broth up to the supreme court is something of grate political divide   so just look as court cases

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.

may i ask which amendments?