50 POINTS How did conflicts in Europe and Asia in the first half of the 20th century lead to an expansion of America’s role in the world?

this was only 25 points though?

i belive the classic sword and a shield would do

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.