The Inca, or more accurately Andean people in general, gave the world potatoes, which fueled a post-Columbian population explosion in Europe and has become of the top four crops in the world. Quinoa, another crop developed by Andean peoples, is currently experiencing a surge of global interest as it can thrive in conditions that many other crops can't. If you see a guinea pig in your local pet store, you can thank Andean peoples for that too. If you have something made from alpaca wool, that's another thing to thank Andean peoples for since they domesticated llamas and alpacas.

Also, in one of those weird twists of history, the Inca paved the way for the Scramble for Africa. European colonization was held back by tropical diseases which Europeans had little to no immunity. The most notable of these is malaria. It was Inca physicians who developed the first reliable treatment for malaria that Europe had access to. The Quechua, the dominant ethnicity among the Inca, used cinchona bark for their treatment of the disease, which was introduced to Europe by Jesuit monks. In time, this technique developed into the medicine quinine in the 19th Century, which allowed for large-scale usage and the colonization of tropical Africa by Europeans.