The alphabet is not based on a country. It is the Latin alphabet, developed by the ancient Romans.
The Greeks.
No. The ancient Romans adapted it.
Romans
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.
Romans invented the Latin alphabet. Early English monks adapted it for use in English.
The Romans used the Latin alphabet. This alphabet became the alphabet of western European languages. J, u and w were added later. Some languages added further letters, and some other ones eliminated same letters.
They invented an alphabet and it was later adapted by the Greeks and Romans and it so became the basis of the alphabets we use today.
Omega was a letter of the Greek alphabet.
The ancient Romans used the alphabet we use: the Latin alphabet. Latin was their language. Western languages have adopted and adapted the Latin alphabet.
The Latin alphabet was adapted from the Etruscan alphabet, which was ultimately derived from the Greek alphabet. Its use spread throughout the Roman Empire and became the basis for many modern alphabets, including the English alphabet.