State · 1955 – 1975

South Vietnam

A state of 1955 – 1975 — 20 years in East and Southeast Asia. It followed Nguyễn dynasty and State of Vietnam. It was followed by Provisional Revolutionary Government of the Republic of South Vietnam. The atlas records 25 things within it — wars and battles 13 · regime change 1 · unrest and atrocity 7 · people 4. Its line of rulers holds 4 people, 3 with dated terms. Its own article says it was replaced by Republic.

For the full story, the article on Wikipedia (CC BY-SA 4.0); this page holds what the record says of the state.

Stood: 20 years; 1955 – 1975
Rulers: 4; the President of South Vietnam
Most ground: 180,700 km²; in 1956
Within it: 25; recorded rows
Symbols: 5; on record, with years

Map: South Vietnam in 1956, its borders in gold among its neighbours — South Vietnam in 1956, when it held the most ground the borders dataset draws for it: 180,700 km². Its neighbours wear their tints, as on the atlas's own map. Borders from Cliopatria (CC BY 4.0), coast and rivers from Natural Earth, cities from Reba, Reitsma & Seto 2016 (CC BY 4.0), each city under the name it bore that year.

Where it sits in time

Five thousand years, 3000 BCE to 2026; the state in gold, what it replaced or followed and what replaced or followed it in grey.

Before and after

The states the record files it as replacing or following, and those that replaced or followed it - Wikidata's own statements, each read from this state's side.

Before it

State of Vietnam · follows
Nguyễn dynasty · follows · 1802 – 1945

After it

Provisional Revolutionary Government of the Republic of South Vietnam · followed by · 1969 – 1976

How it ended, as its article says

Replaced by Republic, 1975. Read from the article's section “lead” by its grammar; the claim is only that the article says so.

It was succeeded by the communist-controlled Republic of South Vietnam in 1975.

One sentence of the English Wikipedia article, CC BY-SA 4.0.

Rulers

The line of President of South Vietnam.

killed, executed or dead in battleleft alive by a regular road

Ruler	Reign	Length	How it ended · source
Ngo Dinh Diem	1955 – 1963	8 years	killedWikidata's manner of death
Nguyễn Văn Thiệu	1965 – 1975	10 years	left office aliveread off the dates alone
Dương Văn Minh	1975 – 1975	under a year	left office aliveread off the dates alone

4 rulers, 3 with terms dated as terms, covering 1955 – 1975. Only 20 years of the line are dated - too short for a median. 1 of 2 handovers irregular - a killing, a deposition, a rival claimant, a rising or a coup beside it. The violent-handover count is withheld: power changed hands so often that any rising falls beside one (exposure 0.67, limit 0.6). A blank in the last column means no kin on record, which is coverage, never “unrelated”.

Ground held, by year

km² inside its borders as the borders dataset draws them, measured on an equal-area grid; a step series, held between the years the dataset maps.

180,700 km² in 1960, 169,600 km² in 1975; at its largest 180,700 km² in 1960. Cliopatria, CC BY 4.0.

Flags and arms, in order

Each symbol with the years its own statement gives; the timeline flies the one of the year on screen.

coat of arms, undatedEmblem of the Republic of Vietnam (1957–1963) 01 · CC BY-SA 4.0 · Sodacan
coat of arms, undatedEmblem of South Vietnam (1963-1975) · Public domain
coat of arms, undatedCoat of arms of the Republic of Vietnam (1957–1963) · CC BY-SA 4.0 · Sodacan
coat of arms, undatedCoat of arms of the Republic of Vietnam (1967–1975) · Public domain
flag, 1948 – 1975Flag of South Vietnam · Public domain

What happened within it, by century

Every row the atlas hosts under this state, by the century it began in: wars and battles in red, risings, regime changes and massacres beside them, everything else in grey. A tall bar is a century the record is full for, which is partly a fact about Wikipedia.

1900 – 199925 rows · 13 wars and battles · 8 risings, regime changes and massacres

Ngo Dinh Diem · ruler · 1901 – 1963
My Lai massacre · atrocity · 1968
Nguyễn Văn Thiệu · ruler · 1923 – 2001
Fall of Saigon · battle · 1975
Dương Văn Minh · ruler · 1916 – 2001
Battle of Ap Bac · battle · 1963
Operation Frequent Wind · battle · 1975
Trần Văn Hương · ruler · 1902 – 1982

and 17 more in the atlas.

Among all states

Each measure against the states that carry it, never against all of them: a bar is the share of those states below this one.

How long it stood20 years
stood longer than 23% of 3,187 states with a recorded end or still standing.
The most ground it held180,700 km²
held more ground at its peak than 56% of 1,465 states with a border in Cliopatria.
Wars recorded per centurynone
had more wars on record per century than 44% of 3,187 states, counting the wars the atlas hosts under each.
Rulers on record4
has more rulers on record than 58% of 1,968 states with a line of rulers.

What led to it, and what came of it

The investigation's own picture: 5 causes the record names and 1 result, the strongest six of each at their own years, joined to the state by the kind of claim - a recorded statement solid, the article's sentence dashed, a theory dash-dot.

linkedcoincidence

Open the investigation: every row with its evidence, the conditions at the time, the theories condition by condition, and the succession analysed.

Open in the atlas

On the timeline, 1945 – 1985, with everything that stood beside it.
On the map in 1956, live: scrub the year and watch its borders move.
Investigate it: what led to it, what came of it, and its succession analysed.

Wikidata Q180573 (CC0) · borders Cliopatria, CC BY 4.0 · coast and rivers Natural Earth · symbols from Wikimedia Commons, each credited above · one sentence of the English Wikipedia article, CC BY-SA 4.0 · data built 2026-10-06 · Pastlas v2.9.1, by Oleh Voronko. The published atlas and its data are for non-commercial use.