Which topic is often used as a theme for studying world history since World
War I?

Decolonization and nationalism

studies show tha in 7.5 billion years from now, the expanding sun will engulf, and destroy, the earth.

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.