DALLAS — Siddharth Jaganath wanted to return to India after earning his master’s degree at Texas’ Southern Methodist University. Instead, he built a new life in the U.S. over a decade, becoming a manager at a communications technology company and starting a family in the Dallas suburb of Plano. “You start growing your roots and eventually end up staying here,” the 37-year-old said. His path is an increasingly common one: Immigrants from China and India, many with student or work visas, have overtaken Mexicans as the largest groups coming into the U.S., according to U.S.