Abstract: Recent efforts to formulate quantum mechanics in a way that treats space and time on a more equal footing have led to a variety of spacetime-oriented approaches. In this talk, I will introduce spacetime states, the central objects of the recently developed framework of spacetime quantum mechanics, and show how several existing proposals can be understood as different manifestations of a common underlying structure. In particular, path integrals, quantum states over time, pseudo-density matrices, the Page and Wootters mechanism, superdensity operators, and timelike-entanglement proposals arise from spacetime states through particular evaluations, reductions, or maps. I will emphasize how this perspective clarifies the information encoded by different temporal-state constructions, including their connections to unequal-time correlation functions and Kirkwood-Dirac quasiprobabilities. I will also briefly discuss applications to temporal entanglement, tensor networks, out-of-time-ordered correlators, and relativistic quantum field theory.