Under the U.S. occupation and civil regime, English began to be taught in schools. By 1901, public education used English as the medium of instruction. Around 600 educators (called "Thomasites") who arrived in that year aboard the USAT "Thomas" replaced the soldiers who also functioned as teachers. The 1935 Constitution added English as an official language alongside Spanish. A provision in this constitution also called for Congress to "take steps toward the development and adoption of a common national language based on one of the existing native languages." On November 12, 1937, the First National Assembly created the National Language Institute. President Manuel L. Quezón appointed native Waray speaker Jaime C. De Veyra to chair a committee of speakers of other regional languages. Their aim was to select a national language among the other regional languages. Ultimately, Tagalog was chosen as the base language December 30, 1937, on the basis that it was the most widely spoken and developed local language.