Definition of "unsettled"

Universal Directory of Railway Officials and Railway Year Book, 1946-47. […] Although the preparation of the fifty-second edition of this well-known work proved a far from easy task, owing to the continuance of unsettled conditions in many parts of the world, the response to the endeavours of the publishers to obtain accurate and complete information has exceeded anything that would have been possible twelve months earlier.

1947 January and February, “Railway Literature”, in Railway Magazine, page 64