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The Next-Generation Very Large Array (ngVLA) will be critical forunderstanding how galaxies are built and evolve at the earliest epochs. Thesensitivity and frequency coverage will allow for the detection of cold gas anddust in `normal' distant galaxies, including the low-J transitions of moleculargas tracers such as CO, HNC, and HCO+; synchrotron and free-free continuumemission; and even the exciting possibility of thermal dust emission at thehighest (z~7) redshifts. In particular, by enabling the total molecular gasreservoirs to be traced to unprecedented sensitivities across a huge range ofepochs simultaneously -- something no other radio or submillimeter facilitywill be capable of -- the detection of the crucial low-J transitions of CO in adiverse body of galaxies will be the cornerstone of ngVLA's contribution tohigh-redshift galaxy evolution science. The ultra-wide bandwidths will allow acomplete sampling of radio SEDs, as well as the detection of emission linesnecessary for spectroscopic confirmation of elusive dusty starbursts. The ngVLAwill also deliver unique contributions to our understanding of cosmic magnetismand to science accessible through microwave polarimetry. Finally, the superbangular resolution will move the field beyond detection experiments and allowdetailed studies of the morphology and dynamics of these systems, includingdynamical modeling of disks/mergers, determining the properties of outflows,measuring black hole masses from gas disks, and resolving multiple AGN nuclei.We explore the contribution of a ngVLA to these areas and more, as well assynergies with current and upcoming facilities including ALMA, SKA, largesingle-dish submillimeter observatories, GMT/TMT, and JWST.

Next Generation Very Large Array Memo No. 8 Science Working Group 3: Galaxy Assembly through Cosmic Time