Nahla Al-Arian has been living a nightmare for the past seven months, watching from afar as Israel carries out its scorched-earth war against her ancestral homeland in the Gaza Strip. Like many Palestinian Americans, the 63-year-old retired fourth-grade teacher from Tampa Bay, Florida, has endured seven months of a steady trickle of WhatsApp messages about the deaths of her relatives.

“You see, my father’s family is originally from Gaza, so they are a big family. And they are not only in Gaza...