sentences:  The two senators from the twelfth district were appointed by the U.S. Governor-General.The setup lasted until the establishment of the Commonwealth of the Philippines in 1935, when the bicameral legislature was abolished, as the 1935 Constitution provided only for a unicameral National Assembly.However, when the Constitution was amended in 1940 to re-establish a bicameral Congress, members of the Senate had to be voted at-large, thereby effectively abolishing the district system.