What did Samuel FB Morse invent?

The clues in the name. Samuel Finley Breese Morse invented the More code. It was dots and lines that they used in the war so the enemy couldn't understand the messages they sent. These are some examples.

Bomb: -... --- -- -...

Solider: ... --- .. .-.. -.. . .-.

Attack: .- - - .- -.-. -.-

Samuel also invented changes to existing designs for the telegraph that made its use commercially practical.

Hope this helped! :)