This is going to be worse. Back then it was all nations erecting tariffs against all other nations. It's not 1945 anymore, the US is only about 24% of global GDP. And the US actually has a much lower share of trade as a fraction of its GDP than most other nations.
The rest of the world doesn't have to tariff each other. We're throwing up barriers left and right, but other countries are actually signing new trade agreements to fill the holes we leave behind. The US is going to pointlessly throw itself into a depression, while the rest of the world is going to keep trucking along just fine.