Bertil Ohlin's theory (as applied to the United States over the past twenty-five years) that changes in patterns of international trade are the principal cause of shifts in the distribution of income is a perfectly good neoclassical theory that has been refuted to the satisfaction of most (if not all) neo-classical economists.
In fact, the entire neoclassical Heckscher-Ohlin approach to international trade--that trade is the result of differences in relative factor endowments--is in very big trouble and has been in very big trouble for two decades (in large part because of Paul Krugman).
Brad DeLong