What immigrants in the 1800s and early 1900s retain their cultures?

Creation of ethnic neighborhoods.

Due to large numbers of immigrants and a desire to keep immigrants separate from white, "native" Americans, ethnic neighborhoods called ethnic enclaves were created.

The ethnic enclaves were inhabited by certain immigrant groups such as Little Italy and Chinatown where the group could maintain their culture. These neighbors had the immigrant's churches, grocery stores, newspapers in their native language, and other cultural elements allowing for immigrants to feel at home and slowly transition to American life.

genetics is the study of how dna works, the methodologies defining the new recent technologies allow scientist to have a panoramic view of the entire dna landscape, especially how genomes interact with their environment, including off course, factors outside their organisms.

thus is very possible the existence of both scenarios, where populations of isolated individuals have different genetic traits, and share traits related to genetic mutation, due rats can easily travel overseas using human transport channels. so scientists could get a vast number of data, including human interaction, evolution of rodents, health development, spread of infections, development of new organisms, how genomes evolve in different environments and so on.

a) "how old man winter was driven back " and "ormuzd and arimanes"

hope it