Conversely, the question should be "Who is preventing American agriculture from mechanizing?"

Or, if you are such a pessimist in America's can-do attitude, instead take it from the point of view of market efficiency. If a good cannot be produced cheaply enough for the market to sustain it, the solution is not to modify the social contract and undermine the value of labor for the sake of the good.

We have always solved problems by innovation. The surest way to prevent innovation is to continually provide cheaper and cheaper labor. The Roman empire is an excellent example of this.

Undoubtedly, these issues are more complex. However, this is such a tired old canard. Wages make labor, scarcity makes innovation.