jaylar
In 1860, in America, when the Southern States withdrew from the Union, one representative remained. Only one. That was Andrew Johnson.
The Northern States considered him a great hero and patriot for remaining with the Union.
When Abraham Lincoln ran for his second term, they dropped Hannibal Hamlin as his Vice President and selected Andrew Johnson.
Shortly after, Lincoln was assassinated and Johnson became President.
Imagine the surprise of the American Congress to learn that Johnson was a supporter of slavery, a supporter of the South. He was anti the Plantocracy; Anti-rich white southerners.
They assumed he had remained because he supported the Union. He hadn’t. He had personal picks against those who would be the leaders of the Confederacy.
They got it so wrong.
Assumptions usually do not get us far in life and history.
Asking why would have been a good idea; but supply reasons seems standard.