After falling form a peak of 138.1 million in january 2008 to a trough of 129.9 million in september 2010, employment in the u. s. economy:

This data shows that the job creation and employment have been slow. There were a variety of changes in jobs and specializations in the US. Hiring in other countries for some technical work also made an effect on employment. Another reason was the effect of recession during those years.