can i became a spanish resident?i am a usa resident?

Answer 1

yes.

Residence cards are issued by the foreign nationals office or provincial central police where the applicant is resident. Applications must also be made in person to the nearest national police station with a foreigners department.

If you have any thought that you might wish to reside in Spain, it is best to contact the Spanish consulate or embassy here about the requirements before traveling to Spain, as otherwise you may have to travel home again to obtain the necessary documents and correct visa.

Here is a site with some more helpful info.

Answer 2

A lot depends on what your citizenship is.
http://www.spainexpat.com/spain/information/visas_in_spain_for_work_or_holiday/