When at once were found only in the Americas account for of the world and food supply.?

The crops originally found only in the Americas, such as maize, potatoes, and tomatoes, significantly contributed to global food supply after their introduction to other parts of the world following the Columbian Exchange in the late 15th and early 16th centuries. These staple foods helped to sustain populations and diversify diets across Europe, Asia, and Africa, ultimately transforming agricultural practices worldwide. Their introduction played a crucial role in shaping global Demographics and economies.