Final answer:
Many northern congressmen opposed Thaddeus Stevens' land bill due to differing views on how the South should be reconstructed after the Civil War.
Step-by-step explanation:
Many northern congressmen opposed the land bill introduced by Thaddeus Stevens in Congress in late 1865 because they wanted a more radical approach to reconstructing the South after the Civil War. Thaddeus Stevens' bill proposed redistributing plantation lands and having the federal government control the former Confederate states as conquered territory. However, some northern representatives believed that the southern states should be treated more leniently and allowed to have more autonomy in rebuilding. They feared that Stevens' bill would cause further division and resentment between the North and South.