Donald Trump’s most consequential construction project may be his tariff wall. His latest threat to raise tariffs to 50% on some Canadian goods, as drastic as it is, is not nearly as significant as what’s coming next. By the end of this month, the administration is expected to introduce major tariffs on dozens of countries. Unlike most previous rounds of tariffs, the new ones are backed by monthslong investigations into alleged unfair trade practices. No court has ever overturned this kind of tariff. But the biggest obstacle to undoing Mr. Trump’s tariffs after 2028 will be financial. With the national debt clocking in at a staggering $39.6 trillion, the market responsible for selling this debt has quickly grown addicted to the money coming into the government from tariffs. …In less than a year, America’s financial markets needs them to help cope with the country’s deficit. [to access the full story a NY Times subscription is required]