本书以明代永昌地区军政设置变化为线索，挖掘正史、实录、地方志、文集、碑刻、家谱等资料，围绕永昌地区与周边局势的相互关系，讨论卫所、府州县的关系以及社会变迁。本书将卫所与州县之间的转换过程放置在当时的社会背景之下讨论，并讨论卫所与州县转换的复杂因素以及卫所、州县转换背景下的区域社会文化变迁。
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