Umbrella term for the British possessions and protected Malay states on the Malay Peninsula: the Straits Settlements (Crown colony, from 1826), the Federated Malay States (from 1895), and the Unfederated Malay States (individual protectorates).
The Federation of Malaya gained independence on 31 August 1957; Singapore (separated administratively in 1946 as its own Crown colony) joined Malaysia in 1963 then left in 1965.
The atlas holds 3 border frames for British Malaya — the shape you scrub through changes in 1826 · 1933 · 1945.
Verified via Open Library (author + title + year match); classic contemporary account by a former Resident-General of the Federated Malay States.