The 15th amendment allowed Black men to vote. It was ratified on February 3, 1870.
They cannot own property, testify in the state courts, or become citizens
Invasions of people--many of the groups came as military and fought the Romans as invading forces.
Counterclaim--they were migration patterns as they were attempting to gain access to an empire with advanced trade and education. Migrating to the Roman Empire gave a person or group with extra resources.
During which time? This is not made clear