(1) = Pure Play Foundry (no in-house design)
(2) = Fabless Firm (no in-house manufacturing)
All the major US firms have different core areas of business that serve specific industry segments: Intel (µP), Micron (DRAM), Qualcomm (SoC), Texas Instruments (Analog ICs), NVIDIA (GPUs). Broadcom is more into SC software infrastructure products and just relocated their headquarters from Singapore in the hopes it would clear the Qualcomm deal (heh, hard no).
Samsung and SK Hynix are both predominantly in the DRAM market. TSMC is of course, a contract manufacturer as you know with all kinds of extensive production capabilities but they don't do chip design or engineering. Taiwan does have that though with MediaTek.