Final answer:
The theme of the poem by Antanas Kaztauskis touches on the experience of migration, emphasizing hope, struggle, and resilience amidst adversity, echoing sentiment familiar to the Romantic period.
Step-by-step explanation:
The theme of the poem in passage 1 from 'From the Lithuania to the Chicago Stockyards' by Antanas Kaztauskis is likely to deal with the experience of migration and themes of hope, struggle, and resilience in the face of adversity. This can be inferred from the provided text where the migration of people from the south to the north is depicted alongside the hopeful imagery of a free sky and accompanying birds. Moreover, the repetition of the phrase 'And the migrants kept coming' seems to invoke a sense of triumph over adversity. Similarly, themes of desolation and waiting are presented in the description of Mariana, hinting at a Romantic-period setting with an emphasis on emotion and natural imagery.