Soybeans, which are used for livestock feed, food and biofuels, are among the top U.S. agricultural exports. That hasn’t always been the case. Before the 1960s soybeans weren’t a major crop in the U.S, according to Chad Hart, an agricultural economist at Iowa State University. It wasn’t until the 1990s that soybean production accelerated due to international demand — primarily from China — and soybeans and corn are now dominant in U.S. agriculture.

But U.S. soybean farmers, who typically also grow corn, have been facing financial issues for years even before the onset of the Iran war.

Soybean prices have been persistently low in recent years. The global market has been awash in soybeans, driven in part by Brazil, which surpassed the U.S. as the world’s largest soybean producer years ago.