Importers pass along costs when they can, not when they want. Tariffs artificially increase price, which impacts demand. As demand falls the price falls with it. Whether the price is passed straight through, in part, or not at all depends on the specific market. If the end consumer functions as a monopsonist, the answer might be that the cost is hardly passed through at all. If demand is inelastic, it might be passed through entirely. If there are ready made domestic substitutes, the pass through will be less, if there are none, costs will be passed through more.
The United States is a wealthy market representing a considerable portion of world GDP, and an even greater share of global discretionary spending. In the case of Mexico and Canada, it's hard to see how they could reasonably replace US demand for their products. Exporting overseas costs money, and South American wealth is finite. In the case of Europe, there's no comparable market which stands ready to absorb European exports. The Chinese like to sell, not buy, and no one else has nearly the same purchasing power. In aggregate, I'd say that the US has a greater share of leverage.
They absolutely have a greater share of leverage. Currently. The gaps are closing and eventually we will be replaced. Not as soon as doomsayers say but definitely in my children’s lifetime on the current course we are on.
But nevertheless I’m not talking about the right/wrong of the trade war. I’m simply stating that the lower income people will suffer because the buck will be passed on regardless and increased minimum wage wages aren’t keeping up with costs.