The Greeks.
The alphabet is not based on a country. It is the Latin alphabet, developed by the ancient Romans.
The Etruscans.
The Phoenician alphabet from which the Greeks developed a "true" alphabet, which consists of both vowels andconsonants.
At about 600 BC, a group of people called the Etruscans took power in Rome. At about 509 BC, the Romans revolted and drove the Etruscans out of power in Rome, but did adopt some of their ideas, such as the Greek Alphabet, which the Etruscans adopted from the Greeks.
Romans
No. The ancient Romans adapted it.
The modern alphabet is based on the Latin alphabet, which in turn evolved from the Etruscan alphabet. The Latin alphabet was introduced to the Romans around the 7th century BCE and was derived from the Greek alphabet.
They modified it, as did the Greeks and Romans.
It is generally believed that the Romans adopted the Cumae alphabet‎, a variant of the Greek alphabet, in the 7th century BCE from Cumae, a Greek colony in Southern Italy.
Romans invented the Latin alphabet. Early English monks adapted it for use in English.
The Phoenician adopted the Egyptian alphabet.
They adapted the Phoenician alphabet.