LOTS of industries. But yes, the farming industry (and shift to industrial - also influenced hugely by fuel) is probably the biggest one in terms of social and economic impact in the USA.
I am old. I remember back when my grandfather used a one horse drawn plow to turn his 40 acres and two horses to pull a hay wrak. All his crops were planted and harvested using horses. What happens when the new world order shuts down the mega farmers. No fuel, no electric. Just thinking it might be wise for small farmers to have a horse & plow.