MUNICH — Secretary of State Marco Rubio declared that the United States and Europe “belong together” in a speech Saturday aimed at unifying the Western alliance, while condemning hallmarks of globalization, open borders, unfettered free trade, “deindustrialization,” and mass migration. Rubio’s message, in a keynote address at the annual Munich Security Conference, received applause from a demoralized audience of European leaders who are deeply distressed about divisions with the United States stoked by President Donald Trump’s punitive tariffs, territorial ambitions for Greenland, and disagreements over how to end Russia’s war in Ukraine. “We are bound to one another by the...