Congressional Reconstruction was different from Presidential Reconstruction because it required states to accept the abolishment of enslavement.
annul their declarations of secession.
ratify the Fourteenth Amendment.
provide freedmen with education.

number 1 is a)

it broke up the ottoman empire (just a small fact) and the turkish leaders lost many soldiers.

a big one is

to appoint and regulate officers of the land and naval forces,

which caused much controversy ending the articles

that was the type of government the spanish colonists were used to.