Modernist composers before world war i were mainly preoccupied with changing their approach to:

Modernist composers before World War I was mainly preoccupied with changing their approach to melody, harmony, and tonality. By means of Melody, they change it by having no longer top element. By means of harmony, they created no more functional harmony, the deliverance of dissonance and new measures. They also changed tonality approach to none tonal center. The tonal center was made in new techniques.

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.

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.