4% of the U.S. workforce may be directly "involved" in agriculture, but that is far from a full picture. These crops don't just walk off the farm and end up with their end consumer by magic.
Every exported agricultural product has a lot of OTHER industries with a vested interest in agricultural exports. You have the barge and railroad industries that move grains to ports, along with elevator operators and longshoremen at the ports. You have all the industries that supply these, too. You also have the trucking company whose president I met with earlier this week ... whose contract to haul grain to an East Coast port may be in jeopardy if the global marketplace for his customers' products changes as a result of foreign tariffs.
Your detail/sequence of probable events is Randian, i.e. out Atlas Shrugged. Well done, FRiend. It’s a shame that certain posters only know how to respond with vitriol and personal attacks.
Every action you describe above would be the same for both domestic and imported agricultural products. As a matter of fact, a tariff imposed by China on our exported agri products would INCREASE all of that secondary activity, not decrease it.