In early 1863, Abraham Lincoln did not have many friends in the U. S. Congress. Why would Congress go along with Lincoln's political shenanigans and prop up a President that few had committed to support in the 1864 election?
“Why would Congress go along with Lincoln’s political shenanigans and prop up a President that few had committed to support in the 1864 election? “
I don’t know the answer to your question.
And I don’t know why Congress went along with Lincoln’s decision to kill 600,000 Americans.