AWS has at least 3 publicly-discussed 'clouds' (or partitions, as they're called at AWS). There may or may not be other partitions that cannot be discussed publicly.
There’s a pretty clean demarc between the AWS clouds. With Microsoft because they have O365 and Azure AD dependencies sprinkled everywhere with varying features it’s a real mess. So you can do government contract with with device managed by Windows Autopilot & Intune in a commercial cloud, have email in a Gov Community Cloud, and deliver apps in a US Gov cloud, all with different identities etc.