[简答题] The Frontier and the Family The impact of the frontier has been traditionally assumed by historians, who have studied its (47)______ on mountain men and cowboys, on different political and social institutions. Yet the impact of the frontier on the most common dimension of life—upon the family—remains largely (48)______. Although family has been (49)______ significant in the historical process, it is relatively a new area of historical research. In terms of westward migration, family played a special role. For people who (50)______ the church as much as the state, family was the only institution that could be entrusted with the enterprise of settling the continent. A Christian family was enough of the church; a Christian family was (51)______ expression of political and social order. In 1862, Congress provided for the (52)______ of lands to heads of households in a law, but that law merely recognized that settlement had been the business of families s