Ser is who you are. for example, "Yo soy mexicana." (I am mexican) which is to be something or someone. Estar is your state of action as in location . For example, "Yo estoy en la tienda" (I am at the store".
1. People who were born in Puerto Rico are called Puertorriqueño/s .
O las mochilas would be or the backpacks not the backpacks
