Assertion: soybean | /r/CapableOf | spread to the corn belt
Facets:
value: by the mid-1800s with major acreage
type: OTHER
Source sentences:
text: First planted in the United States in 1765, soybeans spread to the Corn Belt by the mid-1800s with major acreage not seen until the 1920s, when it was used mainly as a forage crop.