We present a local-to-global cosmological framework in which cosmic acceleration emerges from structure formation in an inhomogeneous Einstein–de Sitter (iEdS) universe, without dark energy. The model exhibits a quasilinear coasting evolution toward an effective Milne state driven by growing inhomogeneities. We test the iEdS model with $H_0=72.5\mathrm{km}{\mathrm{s}}^{-1}{\mathrm{Mpc}}^{-1}$ and ${\mathrm{\Omega }}_{\mathrm{m},0}=0.272$ using cosmic microwave background, baryon acoustic oscillation, and type Ia supernova data. The iEdS model fits the data comparably to $\mathrm{\Lambda }\mathrm{CDM}$ and resolves the $H_0$ tension, while yielding a cosmic age $t_0\simeq 13.67\mathrm{Gyr}$ consistent with globular-cluster estimates.

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• Cosmological parameters
• Dark energy
• Evolution of the Universe