chili

not sure which chili/pepper you are referring to. is this for a chili using chili peppers? or is this a curry using chili's? thai curry? indian curry? a chile relleno? quite a few western foods can use any of them, sauces, chili, stew, even sandwiches or dips....

Mexican, Central American and Caribbean cuisines all use chillies extensively.  With a few exceptions, the food tends to be less piquant the farther south you move into South America.

Chillies are only native to America, mostly from exactly the same regions as the hot cuisines.  They did not come to anywhere in the "old world," including Europe, Africa and Asia until the Spanish brought them back from the Americas.  Your threshold premise that their use was centralized and oriiginal to south Asia, the sub-continent and the islands -- where you're from -- just goes to show how human it is to generalize that the way we grew up is the way it always was.  Let me add, I'm not telling you this to say you're dumb.  You made a normal assumption which just happens to be mistaken.

BDL

Chilies are used as a major spice in numerous cuisines, both New World, Old World, and Africa, as well as Asia.

One interesting note: In general, the closer to the equator a country lies, the "hotter" the food will be.

In terms of Western cuisines, BDL pretty well summed it up, with the noteable absence of the American Southwest, where chilies are king.

Fusion cuisines, such as the Creole cooking of the American gulf coast also tend to use chilies extensively. As do many Carribean cuisines. Jamaican jerk dishes, for instance, can blow the roof off your mouth.