Chandragupt mourya was the first indian king who explore their kingdom from magadh(bihar) to afganistan but you know he was labourour son . now you want to know how he had become king from labour yes this is a interesting question arise in your mind .the reason is acharya(teacher) Chanykya who was the greatest teacher and economist of india. he trained chandragupt mourya to become a king because Chanykya wanted that there should be unity in every states of india then he wanted that king should be that person who can inspire people for unity and make india in one nation
then he was searching to find that person who can generate unity in people then he found a child who was playing with their friends and he act like a king and he was saying to his friend that there should not be any partiality between anybody and when Chanykya saw that then he decided that this child should become the king  and that child was Chandragupt mourya.