  Non-locality is one of the hallmarks of quantum mechanics and is responsible
for paradigmatic features such as entanglement[1] and the Aharonov-Bohm
effect[2,3]. Non-locality comes in two "flavours": a \emph{kinematic
non-locality}-- arising from the structure of the Hilbert space--[4-6] and a
\emph{dynamical non-locality}-- arising from the quantum equations of
motion--[2,3,5,6]. Despite of its main role in quantum information processing,
kinematic non-locality is unable to induce any change in the probability
distributions, so that the "action-at-a-distance" cannot manifest[5,6].
Conversely, dynamical non-locality does create explicit changes in probability,
though in a "causality-preserving" manner[6,7]. Recently, the origin of the
kinematic non-locality was related to the uncertainty principle[8], here we
trace the origin of dynamical non-locality to the superposition principle. This
relation adds to the more fundamental understanding of the nature of quantum
dynamics and allows us to establish and identify how the uncertainty and the
superposition principles determine the non-local character of the outcome of a
quantum measurement. Thus, dynamical non-locality emerges as the responsible of
the breakdown of the dynamical classical realism[9] and therefore, as key
feature in the classical-quantum transition. Most importantly, being based on
group theoretical and path integral formulations, our formulation admits
immediate generalizations and extensions to, e.g., quantum field theory.
