How does giving out more visa/green cards create more jobs for Americans?

[richardhutnik]

http://news.cnet.com/8301-1001_3-57473046-92/tech-layoffs-hit-3-year-high-of-51529-in-first-half-of-2012/

The first half of 2012 showed that layoffs are at a 3 year high. The high tech industry apparently has too much manpower.