In order to perpetuate the memory of the pioneers of this state, the county courts of the several counties are hereby authorized, in their discretion, to cause to be erected monuments or tablets in memory of any person or persons engaged in the Indian wars, to mark the sites of the frontier forts and blockhouses constructed and occupied by the early settlers during the Indian wars, and other historic localities, and also the graves of soldiers of the war of the revolution, in their respective counties.