Lincoln had chosen Lee because the both of them had the same view or opinion on slavery.
That's stupid.
" Each states was like a country. Lee did not want to abandoned the state that he loved, Virginia."
No, we were the UNITED States, and though loyalty to state was stronger in the earlier years, they all recognized they were not sovereign entities.
Nope. In all authority not mandated to the federal government by the Constitution or denied to the states, the states were and now remain sovereign.
"The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people."
"The powers not delegated to the United States by the Constitution,
nor prohibited by it to the States, are reserved to the States respectively, or to the people."
Right there. ^ Not sovereign.
And here:
U. S. Constitution Article 1 section 10:
No State shall enter into any Treaty, Alliance, or Confederation; grant Letters of Marque and Reprisal; coin Money; emit Bills of Credit; make any Thing but gold and silver Coin a Tender in Payment of Debts; pass any Bill of Attainder, ex post facto Law, or Law impairing the Obligation of Contracts, or grant any Title of Nobility.
^ Prohibiting States from actions that any Sovereign, independent State has the right to engage in.
To add: Supremacy Clause.
Shall I go on?