  The Poincar\'e gauge gravity (PGG) with the underlying vector fields of
tetrads and spin-connections is perhaps the best theory candidate for
gravitation to be unified with the other three elementary forces of nature.
There is a clear analogy between local frame in PGG and local internal symmetry
space in the Standard Model. As a result, the spin-connection fields, gauging
the local frame Lorentz symmetry group SO(1,3)_{LF}, appear in PGG much as
photons and gluons appear in SM. We propose that such an analogy may follow
from their common emergent nature allowing to derive PGG in the same way as
conventional gauge theories. In essence, we start with an arbitrary theory of
some vector and fermion fields which possesses only global spacetime
symmetries, such as Lorentz and translational invariance, in flat Minkowski
space. The two vector field multiplets involved are proposed to belong,
respectively, to the adjoint (A_{{\mu}}^{ij}) and vector (e_{{\mu}}^{i})
representations of the starting global Lorentz symmetry. We show that if these
prototype vector fields are covariantly constrained,
A_{{\mu}}^{ij}A_{ij}^{{\mu}}=M_{A} and e_{{\mu}}^{i}e_{i}^{{\mu}}=M_{e}, thus
causing a spontaneous violation of the accompanying global symmetries (M_{A,e}
are their proposed violation scales), then the only possible theory compatible
with these length-preserving constraints is turned out to be the gauge
invariant PGG, while the corresponding massless (pseudo)Goldstone modes are
naturally collected in the emergent gauge fields of tetrads and
spin-connections. In a minimal theory case being linear in a curvature we
unavoidably come to the Einstein-Cartan theory. The extending theories with
propagating spin-connection and tetrad modes are also considered and their
possible unification with the Standard Model is briefly discussed.
