The work of converting the undeveloped forest resources of the Lake States into usable forms absorbed the energies of thousands of individual entrepreneurs. Their combined activity was scarcely able to meet the insatiable demand from the growing number of settlements that dotted the Midwestern prairies and from villages throughout the nation that were growing into towns or mushrooming into major cities. A universal building material was indispensable during a time of rapid economic expansion. Moreover, in the prevailing Age of Wood, white pine lumber, of the finest quality and incredibly low in price, was fortuitously available in abundance.