it’s like you believe you can tariff them expecting they won’t do the same. Why do you believe the rest of the world is not going to retaliate and why do you believe America can prosper without the rest of the world?
What’s the point of having a military alliance with countries you puts tariffs on? That’s unfriendly to say the least.
For Canada anyway, there is a manufacturing trade surplus in favour of US. Canadians buy more autos than they make, and also provide affordability for US made products, through components. So it means a reduction in US manufacturing jobs, when better products are available from less hateful countries, and US made goods are too expensive for Americans.