When policy makers on both sides of the Atlantic discuss transatlantic interdependence, they usually point to military and diplomatic arrangements, liquefied natural gas (LNG) shipments, and semiconductor supply chains. The degree to which Europe runs its entire digital economy on American infrastructure receives far less attention. It deserves more. Europe’s digital foundation is almost entirely American. This includes cloud compute, enterprise networking, cybersecurity, collaboration platforms, and data and storage. Seventy percent of the Europe cloud market is controlled by three US companies: Google, Microsoft, and Amazon. This division of labor has benefitted all the participants, providing efficiencies, reducing costs, and allowing interoperability. The Europeans, however, are now taking steps to end it.