What is the main crop grown on the prairies?

                     The prairies in Canada and the USA are enormous grassy plains, which were once the home of huge herds of buffalo.

                    Today the prairies are covered with enormous fields of maize, supplying most of the world’s needs for this important food crop. The agriculture here is true factory farming, where the crops are planted, treated and harvested with vast machines and using very little manual labour.

Picture credit: google