C) a struggle between Congress and President over governmental power.
Explanation:
Andrew Johnson was the seventeenth president of the United States, holding the post from 1865 to 1869 given the assassination of Abraham Lincoln, of whom he had been vice president. Since the Civil War had ended shortly before his presidency, Johnson worried about starting with the reconstruction of the states that had separated from the union, but found opposition from the Republican majority in Congress and was subjected to a political trial
