DAVOS, Switzerland—Rising tensions with the U.S. are spurring new plans in Europe to do something that has long seemed impossible: break with American technology in favor of homegrown alternatives. U.S. President Donald Trump last week dropped his threat to take control of Greenland by force if necessary. But even the possibility of armed conflict with allies has injected new urgency into long-simmering debates in Europe about how to reduce its reliance on U.S. tech infrastructure and tools that support swaths of the economy. The worst-case scenario for European officials? A White House executive order that cuts off the region’s access…

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