How did Achaemenid Persia expand?

How did Achaemenid Persia expand? It was in this land, around the start of the 7th century BC, that Cyrus the Great - the man who would go on to form the sturdy foundation of the Achaemenid Empire - was born. It is believed that Cyrus was the son of Cambyses I and the grandson of Cyrus I, all preceded by Teispes. ♦Consider supporting the Channel: https://www.patreon.com/Knowledgia ♦Please consider to SUBSCRIBE: https://goo.gl/YJNqek ♦Music by Epidemic Sound ♦Script & Research : Skylar Gordon #History #Documentary #Persia