Government jobs? Because that's the only kind a president can make.
A President can enforce laws covering immigration, illegal and legal, which provides more jobs for citizens.
A President can create an economic climate conducive to business growth, hence jobs.
A President can promote a reduction of regulations, i.e. EPA, which fosters new businesses and expansion of existing businesses.
Most of all, a President can foster a feeling of optimism within the country, making businesses more willing to grow and reach.