On 24 October 1956 Diệm enacted a reform of the administrative divisions system of the Republic of Vietnam in the form of Decree 147a/NV. This decree divided the region of Trung phần into Trung nguyên Trung phần (the Central Midlands) and Cao nguyên Trung phần (the Central Highlands).
On 24 October 1956 Diệm enacted a reform of the adm.inistrative divisions system of the Republic of Vietnam in the form of Decree 147a/NV This decree divided the region of Trung phần into Trung nguyên Trung phần (the Central Midlands) and Cao nguyên Trung phần (the Central Highlands).