prairie madness
... that settlers of the American frontier in the 19th century sometimes fell victim to prairie madness, in which social isolation and other hardships of life on the prairie caused them to develop mental illness?
... that settlers of the <a href="./American_frontier" id="mwB2g" rel="mw:WikiLink" title="American frontier">American frontier</a> in the 19th century sometimes fell victim to <b id="mwB2k"><a href="./Prairie_madness" id="mwB2o" rel="mw:WikiLink" title="Prairie madness">prairie madness</a></b>, in which social isolation and other hardships of life on the prairie caused them to develop mental illness?