The proportion of conservative Republicans supporting U.S. activism in world affairs has fallen by 19 points to 39%. Since 2004, liberal Democrats and independents also have become less supportive of U.S. global engagement, but the change has been most dramatic among conservatives.

This shift is part of a broader blurring of partisan differences in opinions about America’s role in the world. A recent Pew Research Center survey found that, for the first time in a decade, as many Republicans (45%) as Democrats (43%) said the United States “should mind its own business internationally.” In three surveys conducted between 2002 and 2005, only about half as many Republicans as Democrats expressed this view.