Analysts say that Mr. Trump settled on a partial economic deal with China in order to smooth his path to reelection. In that agreement’s aftermath, the markets are now priced for continued economic growth. This raises doubts that 2020 is the year when he presents a major trade challenge to Europe. Afterall, that would reimpose the economic risk just removed by the China deal. However, collectively the calendar and events make some conflict unavoidable. It is unlikely that agreement will be reached at Davos next week on how to handle taxation on America’s FAANG companies, especially since one fourth of the six tech dynamos exceeded $1 trillion in valuation this week. This will result in a transatlantic tariff fight. Also, Europe...