1 May on the map of history
5 events the records the map draws date to 1 May, from 1940 to 1995. Each one opens the map on that very day.

- 1940
Zaoyang–Yichang — Yichang is taken, and with it the last river port below the gorges to Chongqing
War record · World War II · 1940-05-01 – 1940-06-18
Open the map on this day → - 1954
The map begins drawing South Vietnam, North Vietnam; the map stops drawing Vietnam (France)
Border record (CShapes 2.0)
Open the map on this day → - 1963
The map begins drawing West Irian (Indonesia); the map stops drawing Dutch New Guinea (Netherlands)
Border record (CShapes 2.0)
Open the map on this day → - 1975
The map stops drawing South Vietnam; new borders for North Vietnam
Border record (CShapes 2.0)
Open the map on this day → - 1995
What this page states
A border event is what the border record states about its own outlines, under the names IntMap’s map writes on that day: «the map begins drawing», «stops drawing», «new borders for». It is computed by the map’s own code, comparing the day with the day before.
A name the record does not date is not listed: the map’s table of era names is written in years, so a renaming that falls on another country’s border day is left out.
OpenHistoricalMap, which the map draws from 1689 to 1885, is not included: its dates carry no precision, and most of its first-of-the-month dates are months or years written as days.
The war record covers only the wars IntMap documents day by day (World War I, World War II, Korean War, Vietnam War, Arab–Israeli Wars, Yugoslav Wars).
Sources
CShapes 2.0 (Schvitz et al. 2022, icr.ethz.ch/data/cshapes) · CC BY-NC-SA 4.0
Territory and dates: the documented record, compiled in scripts/wars/. Country outlines: CShapes 2.0 (Schvitz et al. 2022, icr.ethz.ch/data/cshapes).