Hello everyone, this is Satoshi Hisa. As suggested reading about the relation between Buddhism and immigration, I would like to introduce the book as the below.

Buddhism in America: The Social Organization of an Ethic Religious Instituion Tetsuden Kashima,1977,Greenwood Press

The book may be helpful to understand social and historical backgrounds of missionary's of Buddhism in the USA in 20th century. For example, the author ellucidates the tendency of racial exclusion of the immigrant, which has influenced on the spread of Buddhism in the USA. By considering these pollitical and historical backgrounds from this book, we may construct a more transdisciplinal approach to the study of immigrant and Buddhism.