All free men in the Roman Empire were to be given full Roman citizenship

Evidence

https://en.wikipedia.org/wiki/Constitutio_Antoniniana (Wikipedia)

corroborated: 2 independent passages support this claim
XREF: connects to: Caracalla extended Roman citizenship to nearly all free imperial inhabitants — Stephen Kershaw, A Brief History of the Roman Empire, 1237; Universal Roman citizenship was enacted after citizenship lost its key privileges — Stephen Kershaw, A Brief History of the Roman Empire, 1237; Caracalla made all people in his empire Roman citizens mainly to increase tax revenues — Constitutio Antoniniana (citing Cassius Dio, Roman History Bk 78) (+1 more)

Caracalla made all people in his empire Roman citizens mainly to increase tax revenues (similarity 0.92)
Caracalla extended Roman citizenship to nearly all free imperial inhabitants (similarity 0.90)
Caracalla granted citizenship to nearly all free inhabitants except the small group of dediticii (similarity 0.89)
Universal Roman citizenship was enacted after citizenship lost its key privileges (similarity 0.89)
Roman citizenship remained non-universal after 212, excluding slaves, Junian Latins, dediticii, and barbarians (similarity 0.86)

Universal Roman citizenship was enacted after citizenship lost its key privileges #qualifies (0.80) — Stephen Kershaw, A Brief History of the Roman Empire, 1237