Minimum wage in the United States was established by the Fair Labor Standards Act of 1938. So, the minimum wage has been around for awhile.
Every state is different as to what their minimum wage is. Many states have established their own minimum wage -- which is usually higher than the federal minimum wage.
For example, the current federal minimum wage is $7.25. (It increased from $6.55 on July 24, 2009.) But in my home state of Washington, the minimum wage is $8.55.
The nice thing about this is the fact that in situations where the federal state laws have different minimum wages, the higher wage always prevails. This works to the benefit of minimum wage workers, so employers cannot choose to pay the lower minimum wage.
Here's a list of minimum wages by state. (Interesting!)
photo credit: will engelmann
Here's a list of 