I’m a letter to Horace Greeley what did president Lincoln give as his reason for waging the civil war

Explanation:

President Lincoln wrote a letter to Horace Greeley. In a letter to Horace Greeley, President Lincoln said to the public that his sacred duty as President of the United States in fighting the South was to preserve the Union, partial or even total emancipation at all costs. His purpose was not to free the slaves.

all of the choices are correct