Suppose the U.S. economy is in equilibrium at the long-run real interest rate that prevails when aggregate

Question:

Suppose the U.S. economy is in equilibrium at the long-run real interest rate that prevails when aggregate expenditures equal potential output. Draw a diagram of aggregate expenditures showing this initial equilibrium. Then suppose that foreign demand for U.S. exports falls due to a recession abroad. Show how the long-run real interest rate will change and explain your results.