[jeffersondem]

“And Lincoln's support for the 15th Amendment (black suffrage) is what triggered John Wilkes Booth to murder him.”

By some accounts, the 15th amendment was passed by Congress in 1869 and ratified in 1870.

[BroJoeK]

quoting BJK: "And Lincoln's support for the 15th Amendment (black suffrage) is what triggered John Wilkes Booth to murder him."

jeffersondem: "By some accounts, the 15th amendment was passed by Congress in 1869 and ratified in 1870."

Some people claim I'm too long winded, so I look for ways to reduce words, as in this case.
By John Wilkes Booth's own account he was "triggered" on hearing Lincoln call for African American suffrage,

"Booth was in the crowd outside the White House when Lincoln gave an impromptu speech from his window.
Lincoln stated that he was in favor of granting suffrage to the former slaves, and Booth declared that it would be the last speech that Lincoln would ever make.[97][99][100] "

The 15th amendment covered suffrage for former slaves.