I will present cosmology results from the Dark Energy Spectroscopic Instrument (DESI) year-1 data for the expansion history derived from precise measurements of the Baryon Acoustic Oscillations (BAO). The results particularly include new stringent constraints on the dark energy equation of state, the Hubble parameter, spatial curvature, and neutrino mass from DESI data with and without various other available cosmological data sets. Constraint on H0 will be provided independently from the CMB and the local measurements. Dark Energy results in some tension with the cosmological constant of LCDM will be presented. Some cosmological implications of the results will be briefly discussed.