This tendency to make the public official less directly dependent upon the people or their immediate representatives is clearly seen in other important changes made in the state constitutions during this period. Popular control over the legislature was diminished by lengthening the terms of the members of both houses and by providing that the upper house should be elected for a longer term than the lower. Georgia established an upper house in 1789 and made the term of office of its members three years. In 1790 Pennsylvania also added a senate whose members were to be elected for four years, and South Carolina increased the term of its senators from one to four years. Delaware extended the term from one to two years for members of the lower house and from three to four years for members of the upper house and made the legislative sessions biennial instead of annual in 1831. North Carolina increased the term of members of both houses from one to two years and adopted biennial sessions in 1835. Maryland in 1837 extended the term of senators from five to six years, and in 1846 established biennial sessions of the legislature. The responsibility of the legislature was still further diminished by the gradual adoption of the plan of partial renewal of the senate, which was incorporated in the Revolutionary constitutions of Delaware, New York and Virginia and later copied in the Federal Constitution. This ensured the conservative and steadying influence exerted by a body of hold-over members in the upper house. With the exception of five states in which the members of one branch of the legislature were elected for terms varying from two to five years, the Revolutionary state constitutions provided for the annual election of the entire legislature. This plan made both houses conform to the latest expression of public opinion by the majority of the qualified voters at the polls. And since neither the executive nor the courts possessed the veto power, the system ensured prompt compliance on the part of the law-making body with the demands of the people as expressed in the results of the legislative election. The influence of public opinion on the state governments was greatly weakened by the constitutional changes above mentioned. The lower branch of the legislature, inasmuch as all its members were simultaneously elected, might be regarded as representative of recent, if not present, public opinion, though effective popular control of that body was made more difficult by lengthening the term of office, since this diminished the frequency with which the voters could express in an authoritative manner their disapproval of the official record of its members. Under the plan adopted present public opinion as formulated in the results of the last election was not recognized as entitled to control the state senate.