The breadbasket of a country is a region which, because of richness of soil and/or advantageous climate, produces large quantities of wheat or other grain. Rice bowl is a similar term used to refer to Southeast Asia, and California's Salinas Valley is often referred to as the world's salad bowl. Such regions may be the subject of fierce political disputes which may even escalate into full military conflicts.
Sicily and Africa were considered the breadbaskets of the Roman Republic. Later on, Egypt was considered the breadbasket of the Roman Empire. Crimea was the source of a huge quantity of grain supplied to Greek city-states, especially Athens.
Since subsistence agriculture was the dominant economic system in most of Morocco's history, it's difficult to speak of a breadbasket region. All regions produced their own wheat and barley to feed themselves and their livestock. With the European commercial penetration in the second half of the 19th century, Morocco started to export wheat to Europe despite the objection of the ulama (religious establishment). The Chaouia and Doukkala plains became the most important suppliers of wheat for export. This is logical given their proximity to the coast. The ports of Casablanca and Feddala, today's Mohammedia, serviced the Chaouia Plain while the port of Mazagan serviced Doukkala.
After Morocco's independence, agriculture in Doukkala became geared toward irrigation so less area has been devoted to wheat, whereas Chaouia maintained its status as a major wheat producing region thanks to its dark soil called tirs and relatively abundant rainfall (avg. 400 mm/year).
The Free State province is often considered the breadbasket of South Africa due to its wheat, sunflower and maize fields.