Over the past decade, foreign direct investment (FDI) in the United St
ates has grown dramatically, changing the composition of many U.S. ind
ustries and bringing foreign-owned firms into the domestic political p
rocess. Presumably, FDI also has affected the politics of protection,
by both altering the domestic coalitions around protectionist demands
and shifting the potential benefits that protectionism is likely to br
ing. To understand this process, we create and test a model that exami
nes the level of inward investment and the extent to which this invest
ment either complements or substitutes for existing import levels. Imp
ort-complementing investment, we suggest, will cause a split in protec
tionist demands, with local producers favoring protectionism and forei
gn investors pushing for free trade. Import-substituting investment, b
y contrast, will create convergent interests between local and foreign
producers. In both cases, inward FDI reshuffles traditional alliances
and demands for protection, challenging many prevailing views about p
rotectionism in the United States.