Explain the causes and effects of the United States entering world war 2?

Cause:   Japanese attack on Pearl Harbor.

Effects: US joins British and fight against the Nazis

             US starts mass production of devices.

              They win the war

Explanation:

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.

the answer is mass marketing.