The Globe and Mail reports in its Thursday edition that the provinces have finally agreed to remove the barriers to selling alcohol to each other. A Globe editorial says those barriers should have been eliminated at the start of Confederation. Instead, it took Donald Trump's trade war to spur the provinces into action, if "spur" is the correct verb for a leisurely 17-month effort. Under an agreement signed last month, nine provinces -- all except for Quebec -- signed the agreement that will allow breweries, wineries and distilleries to sell alcohol outside of the provinces where they are based. The premiers signed the agreement one day after Mr. Trump threatened to put a 50-per-cent tariff on a wide-range of Canadian goods, including alcohol. "In the face of President Trump's latest tariffs, it's more important than ever that Team Canada work together to build a more united, resilient and self-reliant Canadian economy," Ontario Premier Doug Ford said. Knocking down barriers to interprovincial trade through such measures as a direct-to-consumers alcohol sales agreement is, in principle, an excellent idea. With no end in sight to Mr. Trump's trade war, producers' ability to reach new markets should not be hampered.