Scholars have compared the emergence of democracy in America with other countries, regarding the frontier experience. Selwyn Troen has made the comparison with Israel. The American frontiersmen relied on individual effort, in the context of very large quantities of unsettled land with weak external enemies. Israel by contrast, operated in a very small geographical zone, surrounded by more powerful neighbors. The Jewish pioneer was not building an individual or family enterprise, but was a conscious participant in nation-building, with a high priority on collective and cooperative planned settlements. The Israeli pioneers brought in American experts on irrigation and agriculture to provide technical advice. However, they rejected the American frontier model in favor of a European model that supported their political and security concerns.