A Greeting Story

I live in a studio apartment in Boston. The building I lived is a big building and its tenants are generally students. The owner of building is an Arabic company and therefore the security guards are also Arab in this building. At least I know several of them and they always greet me in Arabic "Salam aleykum" 

Tonight, when I was coming back to my apartment I saw one of the security guards outside. And I greeted him saying "Salam aleykum". He answer me in the same way but his greeting was a little hesitantly.

After some chatting I noticed his cross necklace. When he noticed I looked at his necklace he said "I am from El Salvador and my mother made it for me"

I understood that all security guards who works in the building are not Arab. (7/13/2012)