It looks like Spain created the first guitar, Italy created the first 6 string, and German/American created the first steel guitar.
The exact origins of the guitar are unclear, but many people have contributed to its development over the centuries.
Early guitar development
- Early versions: Developed in Greece, Turkey, Persia, and Africa.
- Arabic oud: Brought to Spain by the Moors, Muslim inhabitants of Northern Africa. Europeans added frets to this instrument and called it a "lute".
- Greek lyre: Some scholars argue this is the beginning of the guitar family tree.
Modern guitar development
- Christian Frederick Martin: A German immigrant to the United States who created the first guitar that most resembles the acoustic guitars we still buy today in the 1930s.
- Gaetano Vinaccia: An Italian luthier credited for discovering the first six stringed guitar.
- Antonio Torres Jurado: Credited as one of the most important inventors in the history of guitar.
- Adolph Rickenbacker: Co-founded the famous company Rickenbacker guitars.
Other guitar inventors
- Robert F. Flemming Jr. Invented the guitar-like instrument "Euphonica".
- Roger C. Field Designed and built an electric guitar with a folding neck called the "Foldaxe" for Chet Atkins.
"The first 6th string guitar was made in the year 1779. Almost 200 years later an Italian male, Gaetano Vinaccia, was working on something and then created the first ever six string guitar. Gaetano Vinaccia was a stringed instrument maker who was born in 1759 and died in 1831."
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The first ever guitar was made in Spain way back in the 15th century. Made from wood they put four strings like a bass but two strings have the same tune and the other two strings have a different tune."
https://lindynews.org/8378/entertainment/history-of-the-guitar/