The three parts of Andrew Johnson's Reconstruction Plan include:
1) Amnesty (forgiveness) to most Confederates who took an loyalty oath- Johnson did this in hopes that the South would not secede from the Union again. However, giving forgiveness to these individuals without punishing them upset several Northern politicians.
2) Southern states could form their own governments after they cancelled federal debt. This also upset Northern politicians, as they wanted to be able to have more control over the South out of fear that they will not follow the newly established constitutional amendments.
3) Southern states had to ratify the 13th amendment. This amendment outlawed slavery across the entire United States. This ensured that there would be no forced labor.
B. Confederate states refused to send troops to the US army.
Assuming you're referring to Frederick Lucas, he says that the preamble to the Declaration of Independence "sets the tone" for the rest of the document by making it clear why exactly the founders have submitted it.
