Which theory has been suggested to explain the rise in income inequality in the United States?

Question

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All three factors (the decline of the manufacturing sector, a rise in the number of two wage families, and unskilled labor overseas) have been suggested as contributing to the rise in income inequality in the United States. The decline of the manufacturing sector has led to the loss of high-paying jobs for low-skilled workers, while the rise in two wage families has led to increased competition for skilled jobs. Additionally, unskilled labor overseas has led to an increase in the supply of labor, which has put downward pressure on wages.

Which Theory Has Been Suggested to Explain the Rise in Income