First-order phase transitions produce abrupt changes to the character of both ground and excited electronic states. Here we conduct electronic compressibility measurements to map the spin phase diagram and Landau level (LL) energies of monolayer WSe_{2} in a magnetic field. We resolve a sequence of first-order phase transitions between completely spin-polarized LLs and states with LLs... https://parisnaturalfoodes.shop/product-category/silicon-beauty-liquid/