That is a picture of Hagia Sophia located in Istanbul, Turkey. The Hagia Sophia served as a center for religious, political, and artistic life for the Byzantine Empire (Eastern Roman Empire). It started as a place of great importance for the Byzantines, but then became a extremely important site of worship when Sultan Mehmed II conquered Constantinople. (Constantinople is modern day Istanbul)
Confucius wrote this. He was a Chinese teacher, editor, politician, and a philosper in the Spring and Autumn period of Chinese History. He was very influential and was known for his popular aphorisms ans for his social interactions.
In the cartoon, now-prosperous immigrants object to further immigration to America. The meaning behind the prosperous immigrants' shadows is that there is an underlying secret to how the immigrants became prosperous or their lives are in danger because they are more prosperous than the locals.
Joseph Stalin was the powerful and ruthless leader of the soviet union from 1929-1953