Debate over jobs Americans just won't do

Many small businesses rely on migrant labor. These jobs are generally low end, labor intensive, like landscaping. These are often jobs that American's do not want to do. These companies are afraid that if congress continues to crack down on immigration, they will lose their employment base. Employers will now have to spend more on advertising to find workers. A reason for the scarce amount of workers is that the labor force is becoming older and better educated, and these jobs usually appeal younger workers with no college education.
The labor field of blue collar jobs such as farming, cleaning, construction, and food preperation has a terrible time immigrant workers. It is estimated that over 70% of the labor force in this industry does not have proper immigration status. There are about 12 million illegal immigrants working the in the US. Employers take advantage of these illegal workers, and pay them less money, which makes it difficult for American's to compete with the workers who get paid less yet do the same amount of work.
When employers pay below market wages, it slices into the American employment rates, and it is not fair to do to the rest of America. To combat this, congress removed the guest/worker program that allowed illegal immigrants to acheive legal status by working. The US is in the process of creating a 700 mile long fence along the US/Mexican border.