Why is prairies of north America called grain storage of the world?

The prairies of North America, particularly in regions like the Great Plains, are often referred to as the "grain storage of the world" due to their vast expanses of fertile soil and favorable climate for agriculture. This area produces a significant portion of the world's wheat, corn, and other grains, benefiting from rich nutrients and extensive flatlands ideal for farming. Additionally, advanced farming techniques and technologies have further enhanced yields, solidifying its reputation as a crucial hub for global grain production.