Comparing the presidential plan and the congressional plan for reconstruction, one would most likely conclude that

Answer is: presidential plan was more lenient toward South.
After election in 1866 congressional plan take control of Reconstruction policy.
Congressional plan was harsher. Congressr emove former Confederates from power and enfranchise the freedmen. Presidents Abraham Lincoln  took moderate positions toward South.

The basic assumption of the US role as sole superpower underlies American peacekeeping efforts of the 1990s is "Accountability". Every people is accountable for this words and held responsible for his actions. As an example, the president is accountable to his people as a whole.