Answer:
On the evening of April 14, 1865, President Lincoln was killed by a southern fanatic: as a result Johnson became president of the United States.
The new president tried to carry out Lincoln's plan, that is to reconstruct the South and pacify its souls in the name of national harmony, but he did not have the energy and prestige of his predecessor and suffered numerous attacks by the Radical Republicans of the North, such as Edwin McMasters Stanton and Thaddeus Stevens. His plan also clashed with that of the Congress, largely dominated by Radical Republicans, who wanted to punish the Southern states and subject them to military control, as well as to constitute a solid electoral base for the party with the support of the African American population.
At the end of the Civil War, in fact, Johnson was able only to promulgate an amnesty for the participants in the secession and to propose to the Congress the appointment of a commission for the reconstruction of the South. However, Johnson clashed several times with the Congress, placing the presidential veto on numerous laws that he said could have exacerbated the souls of the Southerners, often without success.
