The Iroquois signed the Fort Stanwix Treaty of 1768, ceding the lands south of the Ohio to the British. European expansion into the upper Ohio valley increased. An estimated 4,000 to 5,000 families settled in western Pennsylvania between 1768 and 1770. Of these settlers, about a third were English, a third were Scotch-Irish, and the rest were Welsh, German and others. These groups tended to settle together in small farming communities, but often their households were not within hailing distance. The life of a settler family was one of relentless hard work: clearing the forest, stumping the fields, building cabins and barns, planting, weeding, and harvesting. In addition, almost everything was manufactured by hand, including furniture, tools, candles, buttons, and needles. Settlers had to deal with harsh winters, and with snakes, black bears, mountain lions, and timber wolves. Because of the fear of raids by Native Americans, the settlers often built their cabins near, or even on top of, springs, to ensure access to water. They also built blockhouses, where neighbors would rally during conflicts.