It emerged to represent the people with average wealth and economical status which nobles see no change in there lives peasants see only more to envy in there lives .
Hajj unites Muslims because it brings them together to perform an act of worship towards God (Allah). They all perform Hajj to obey Allah and seek forgiveness. Hajj is also performed at a specific time (i.e in the lunar month of Thul-Hijjah) so a lot of Muslims congregate to do this mandatory act of worship.
