Yeah. We don’t know how it will affect China. But some people have calculated how much it will affect US people

Trump’s taxes on imports (tariffs) from Canada, Mexico, and China will cost people in the United States somewhere around $260 billion a year or around $2,000 a household.

Here is an article about it:

Trump Set to Whack US Working Class With Historic $2,000 Tax Hike

The second aim is the redistribution the wealth from the poor to the rich.

This will definitely affect every American, every Canadian, and all citizens and residents of any country targeted by a trade war.