A nation divided
The USA has a varied climate, so we might expect yields to differ between states. Rather than trying to reason about 50 states separately, we can use the USA Census Regions to get 9 groups.
The "Corn Belt", where most US corn is grown is in the "West North Central" and "East North Central" regions. The "Wheat Belt" is in the "West South Central" region.
dplyr is loaded, the corn and wheat datasets are available, as is usa_census_regions.
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# Inner join the corn dataset to usa_census_regions by state
corn %>%
___(___, ___ = "___")