It had nothing to do with. What killed states rights was done 50 years after the Civil War ended.
Amendment 16 - Status of Income Tax Clarified. Ratified 2/3/1913.The Congress shall have power to lay and collect taxes on incomes, from whatever source derived, without apportionment among the several States, and without regard to any census or enumeration.
Amendment 17 - Senators Elected by Popular Vote. Ratified 4/8/1913.
The Senate of the United States shall be composed of two Senators from each State, elected by the people thereof, for six years; and each Senator shall have one vote. The electors in each State shall have the qualifications requisite for electors of the most numerous branch of the State legislatures.
When vacancies happen in the representation of any State in the Senate, the executive authority of such State shall issue writs of election to fill such vacancies: Provided, That the legislature of any State may empower the executive thereof to make temporary appointments until the people fill the vacancies by election as the legislature may direct.
This amendment shall not be so construed as to affect the election or term of any Senator chosen before it becomes valid as part of the Constitution.
You lost me.
The Southern states left the Union before Lincoln took office. He ran on a platform of preventing the spread of slavery.
The War started when the South attacked Fort Sumter. I don’t see that any of this is Lincoln’s fault.
Since it was the Southern States that were trying to force Northern States to police their slaves, I don’t see that the Southern States cared about States Rights at all.
If Lincoln didn’t force the Southern States back into the Union, none of us would be here to talk about it.