International audienceAmerican economic nationalism was not born in 2018. Although the United States is often rightly presented as the sanctuary of capitalism, its government has been a staunch supporter of free trade only in rhetoric and not in practice. Today, Donald Trump at least partially breaks with this unspoken and engages in a policy of protection of national firms, including developing protectionist weapons, renegotiating international agreements and calling for a focus on domestic productions. A proponent of "benign neglect" and "beggar thy neighbour" (America first), he clearly unveils a nationalist economic policy, which calls into question the very idea of an economic science capable of defining and leading the optimal solutio...