The second last sentence of the first paragraph is the key message conveying Lincoln's view that war was forced for the protection of the nation.
"<span>Both parties deprecated war; but one of them would make war rather than let the nation survive; and the other would accept war rather than let it perish."</span>
I'm pretty sure they are just known as the common law
An indentured servant was someone who would pay for his journey to the US or for his debt by serving the person who helped him and after a while the debt would be over and the person would be free. The person would have all rights like regular people. Slaves had no rights at all and were not even observed as people and their slavery would never end unless the owner specifically freed them. Slavery was not contractual unlike indentured serviture.
He launched Operation Linebacker. He bombed Hanoi and Haiphong that led to the
destruction of the North’s economic and industrial centers. He continued the bombings and also threatened to withdraw U.S. and end the agreement. Nixon halted the bombings and signed the
Paris Peace Accord that ended U.S. involvement in the area.