(I) Early world history focuses on agricultural
civilisations, but it must also pay attention to regions that
developed different kinds of economies and different
organisational structures. (II) The development of
agriculture was a radical change in humans' way of
life. (III) By providing a dependable source of food, it
allowed people to live in larger groups. (IV) Later on,
toolmaking technology advanced with the discovery of
metalworking, which in turn further increased
agricultural production. (V) Increased production freed
some members of the society to perform other kinds of
work and this in turn encouraged a further series of
organisational changes we call civilisation.