JavaScript, 233 bytes

Math.random()>0.5?(a="Under the spreading chestnut tree")+"\nI "+(s="sold")+(y=" you ")+(n="and")+y+s+" me.\nT"+(h="here ")+(l="lie ")+"they "+n+" "+h+l+"we\n"+a+".":["WAR","PEACE.\nFREEDOM","SLAVERY.\nIGNORANCE","STRENGTH."].join(" IS ")

Wrote this without looking at other answers. Makes good use of assignments as expressions.