The 8-1 opinion was written by Justice Brett Kavanaugh, with Justice Sonia Sotomayor dissenting.

The case concerned Supplemental Security Income that is available to those living in the 50 states who are older than 65, blind or disabled. But residents of Puerto Rico and other US territories are excluded from receiving the funds.

(They do pay FICA taxes there, but evidently don't get what those taxes pay for.)

"In devising tax and benefits programs, it is reasonable for Congress to take account of the general balance of benefits to and burdens on the residents of Puerto Rico," Kavanaugh wrote. "In doing so, Congress need not conduct a dollar-to-dollar comparison of how its tax and benefits programs apply in the States as compared to the Territories, either at the individual or collective level."