One of the provisions of the enabling act was that, in order to become a state, Illinois must have as many as forty thousand inhabitants. In anticipation of such a provision, the territorial legislature had passed a law in January, 1818, providing that a census of the territory should be taken between April 1 and June 1. A supplemental act provided that as a great increase in population might be expected between June 1 and December, census takers should continue to take the census in their districts of all who should remove into them between June 1 and December 1. The law as framed gave an opportunity to count not only immigrants, but to re-count all who moved from one county to another (such moving being common), and to count in each successive county persons passing through the state. There is no reasonable doubt that at the time the census was taken, the territory had fewer than forty thousand inhabitants. Dana gives a census of 1818, in which the number is given as thirty-four thousand six hundred and sixty-six, and adds: “Another enumeration having been taken a few months after, the amount of population returned was forty thousand one hundred and fifty-six, which exceeded the number entitling the territory to become a state.”(276) In August, 1818, the Constitution of Illinois was completed. Its provisions most likely to influence settlement were those concerning the elective franchise and slavery. It provided that “In all elections, all white male inhabitants above the age of twenty-one years, having resided in the state six months next preceding the election, shall enjoy the right of an elector; but no person shall be entitled to vote except in the county or district in which he shall actually reside at the time of the election.” Slaves could not hereafter be brought into the state, but existing slavery was not abolished, and existing indentures—and some were for ninety-nine years—should be carried out, although future indentures should not run for a longer term than one year. Male children of slaves or indentured servants should be free at the age of twenty-one, and females at eighteen. Slaves from other states could be employed only at the Saline Creek salt works, and there only until 1825.(277) During the congressional debate on the acceptance of the Illinois Constitution, objection to admitting the state was made on the ground that the number of inhabitants was doubtful, and that slavery was not distinctly prohibited, Tallmadge, of New York, who later wished to restrict slavery in Missouri, being the chief objector. The state was admitted, however, and on December 4, 1818, the representatives and senators from Illinois took their seats in Congress.(278) Between 1809 and 1818, Illinois passed from a non-representative territorial government to a liberal state government. The energy of the settlers had done much to hasten the change, and the change, in turn, did much to hasten settlement.