The rapid growth of urbanization
and concentration of most of the
resources requires Bangkok to
have a more sophisticated local
government system.
Under the Public Administration
Act of 1933, Bangkok was part of
the provincial administration.
At the same time the Municipality
Act of 1933 established Bangkok
as a municipality.
In 1971, Bangkok municipality
was merged with Thonburi
municipality, the city on the
opposite bank of Chao Phraya
river.
The new city became
Bangkok-Thonburi Metropolitan
municipality.