  It might be expected that only global symmetries are fundamental symmetries
of Nature, whereas local symmetries and associated massless gauge fields could
solely emerge due to spontaneous breaking of underlying spacetime symmetries
involved, such as relativistic invariance and supersymmetry. This breaking,
taken in the form of the nonlinear sigma-model type pattern for vector fields
or superfields, puts essential restrictions on geometrical degrees of freedom
of a physical field system that makes it to adjust itself in such a way that
its global internal symmetry G turns into the local symmetry G_{loc}.
Remarkably, this emergence process may naturally be triggered by spontaneously
broken supersymmetry, as is illustrated in detail by an example of a general
supersymmetric QED model which is then extended to electroweak models and grand
unified theories. Among others, the U(1)xSU(2) symmetrical Standard Model and
flipped SU(5) GUT appear preferable to emerge at high energies.
