Why does the English alphabet end with z?

Answer 1

The Romans adopted a Greek alphabet , the Cumae alphabet, which had Z placed after F.

A B C D E F Z H I K L M N O P Q R S T V X

Around the 3rd century BC the Z was replace by G because Z wasn't really needed to write Latin. After the Roman conquest of Greece in the 1st century BC, Latin adopted the Greek letter Y and readopted the Z to write Greek loanwords. Y and Z were placed at the end of the alphabet

The English alphabet didn't always end in Z these letters used to follow Z:

& ⁊ Ƿ Þ Ð Æ