The reason: because Tierra del Fuego is separated from South America by a much narrower straight, and there was trading contact across that straight throughout 10,000 years.
因为火地岛与 南美洲大陆仅隔一个非常狭窄的海峡。（麦哲伦海峡） 整个一万年来，贯穿海峡有往来 贸易合同。