India, Feb. 15 -- At an election rally in 2016, Donald Trump, then the Republican presidential nominee, pitched himself to an audience comprising Indian Americans as a "true friend" they will have in the White House if he was elected. In 2019, he repeated that pitch at a rally several times larger. Expect a variation of this exhortation during his visit to India.

No other American president has courted Indian Americans as assiduously as Trump. Indian Americans account for 1% of the population, but punch far above their weight in education, professional standing and wealth. The community has grown politically ambitious in recent years, which is acknowledged by both Republicans and Democrats. Bobby Jindal and Nikki Haley rose through the ran...