Whenever any township, incorporated village, city, or county, in which a veterans’ memorial or monumental building or structure is proposed to be erected, desires to erect or to unite with another township or townships, village or villages, city or cities and county or counties in the erection of such veterans’ memorial building or structure, each such county, township, village or city shall have the right to aid and assist in the construction and building of the same to the same extent as though such building or structure was to be used solely for such township, village and city or county purposes, and each such township, village, city or county shall have power, and they are hereby authorized to contract with each other and thereby determine the proportions that each said township, village, city or county shall pay towards the construction of said building or structure, the architecture and arrangement of the same, and the separate portions respectively, which shall be occupied or used by the respective parties to such contract. The erection of a veterans’ memorial or monumental building or structure is hereby declared to be a township, village, city or county purpose.