There is no such thing as a working holiday visa for entry into the USA.
Quote:
"Unlike some countries, the United States government does not issue work visas for casual employment. In general, work visas are based on a specific offer of employment".
Source:
http://www.usembassy.org.uk/cons_new/visa/niv/ working.html
You can only work in the USA if you meet the requirements specified on that web page. In general, that means working in pre-arranged jobs which require specialist qualifications at advanced degree level.
Chris