How are Xerxes and Darius the same?

Xerxes and Darius, both prominent Persian kings of the Achaemenid Empire, shared several similarities, including their commitment to expanding the empire and their efforts to consolidate power through infrastructure projects. They both undertook military campaigns against Greece, with Darius initiating the conflicts and Xerxes continuing them. Additionally, both rulers promoted Zoroastrianism and maintained a centralized administration to manage their vast territories effectively. Their reigns were marked by significant architectural achievements, including the construction of monumental sites like Persepolis.