Byzantine Empire was a continuation of Roman empire which merely had moved its seat from Rome to a new eastern capital in Constantinople. The Byzantine Empire was Greek , both culturally and linguistically, while the Western Roman Empire spoke Latin.
The old Roman gods lost their importance in the Byzantine empire. Though they preserved the Greek and Roman culture. The Roman empire covered more land than the Byzantine empire on east. The Byzantines became a center of orthodox Christianity.
Reconstruction ended the remnants of Confederate secession and abolished slavery, making the newly freed slaves citizens with civil rights ostensibly guaranteed by three new constitutional amendments.