sentences:  Room and pillar mining was in use throughout Europe as early as the 13th century, and the United States since the late 18th century.It is still in use throughout the US, but has slowed or stopped entirely in parts of Europe.Coal mining in the United States has nearly always operated with a room and pillar layout, although originally operated with significantly more man-power.Room and pillar mining of gypsum was used in Iowa beginning in 1892, and was phased out of use in 1927 due to low recovery and development of technologies that made surface mining more practical, safe, and cost effective.