One-room schoolhouses, or one-room schools, have been commonplace throughout rural portions of various countries, including Prussia, Norway, Sweden, the United States, Canada, Australia, New Zealand, the United Kingdom, Ireland, Portugal, and Spain. In most rural and small town schools, all of the students meet in a single room. There, a single teacher teaches academic basics to several grade levels of elementary-age children. Recent years have seen a revival of the format. One-room schoolhouses can also be found in developing nations and rural or remote areas undergoing colonization.