I do not expect unskilled workers in developed countries to be much hurt by even major new entry into the world market for low-skill-intensive manufactures, simply because these goods are no longer produced in developed countries. The entry of China and India, pushing down the world prices of these goods, will benefit developed-country workers, skilled and unskilled alike.
Wood, Adrian. 1995. "How Trade Hurt Unskilled Workers." The Journal of Economic Perspectives 9:57-80.