How did Caracalla's extension of citizenship in 212 CE affect Roman private law?

The Edict of Caracalla in 212 CE, which granted Roman citizenship to nearly all free inhabitants of the empire, significantly altered the landscape of Roman private law.

Prior to this edict, the application of specific legal frameworks was often determined by an individual's status. Certain components of Roman law, known as the jus civile, were historically reserved exclusively for citizens. Noncitizens were categorized as either Latini (those with specific Latin rights) or peregrini (foreigners or members of territories governed but not fully absorbed by Rome), and they were subject to different legal standards.1

By extending citizenship to almost all free provincial inhabitants, Caracalla’s decree rendered the distinction between these legal statuses largely obsolete. Consequently, the importance of the jus civile as a restrictive category of law diminished, as the vast majority of the empire's free population became entitled to the rights and legal protections previously associated with Roman citizenship.21