When and where did Zoroastrianism begin to flourish? How did Zoroastrianism spread beyond its place of origin

Zoroastrianism arose and flourished in ancient Iran. Its present followers number only about 100,000, mainly the Parsis of India

Zoroastrianism has undergone a number of major changes with different features at different times. the religion exerted great influence on the for-mation of Judaism and Christianity.i

Zoroastrianism originated in an area now occupied by the nations of Iran and Afghani-stan.