1. To be in par with society.
2. To become competent.
3. To become strong and confident.
4. To contribute something to
society.
5. To live a better life.
People with similar physical characteristics--to seek comfort people will find others who look similar to them to create immediate common ground.
This tendency in humans explains why people tend to seek out homogeneous groupings. We seek what we know and therefore we are most comfortable. This behavior can be exploited to create the 'isms' of society like racism or sexism. <span />
It is a symbol to let they know where they were so they didn’t get lost.