This document summarizes Jonathan Dresner's work on transnational immigrant patterns and the relationship between diaspora, modernity, and nationalism. It discusses how chain and return migration lead to concentration in sending and receiving areas. Immigrant communities invest in their home countries through remittances and local institutions. Assimilation occurs across generations as ethnic nationalism develops. Modern infrastructure like travel, communication, and media help maintain connections across borders while invented traditions form new identities. Migration must be understood in the context of modernity and the systems that structure the globalized world.