Astudent writes a term paper about similarities and differences between greek democracy during the classical era and u. s. democracy during the modern era. her paper focuses on which major historical theme?

a.creation, expansion, and interaction of political systems

b.interactions between humans and the environment  

c.creation, expansion, and the interaction of economic systems

d. development and transformation of social structures

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.

a.) are both appointed for life