It is whiter than the rest of Nevada, which is nearly 30 percent Latino and 10 percent black, but local officials and demographers say waves of new arrivals are transforming it into a more diverse suburb with an increasing number of foreign-born residents.

“There was a lot of empty real estate here for many years after the recession,” said Scott Muelrath, chief executive of Henderson’s Chamber of Commerce, as he drove down St. Rose Parkway. And now, “You can go two weeks and come down this street, and there’ll be something new going on.”

He passed just-opened big-box stores and bulldozers leveling the rocky ground for new shipping and distribution warehouses. Henderson, like the rest of Nevada, has tried to diversify its economy since the crash to make it less vulnerable to Nevada’s boom-and-bust cycles. Google has opened a data center, and plans are underway to build a machine-tool plant and a huge Amazon fulfillment center.

Of the more than 141,000 people who moved to Nevada in 2018, about 50,000 of them were from California, The Las Vegas Review-Journal reported, amplifying an eastward flow that goes back decades. Today, nearly a third of the eligible voters in Clark County, which contains about 70 percent of Nevada’s population, were born in California, said Robert Lang, the executive director of Brookings Mountain West. Only one in 10 is from Nevada.

Political analysts argue the recent surge in migration has helped Democrats solidify their control in Nevada. Democrats have about 110,000 more registered voters than Republicans, and have a powerful turnout machine in the unions that represent thousands of casino and hotel workers.

The culinary union, for instance, is particularly powerful because it represents many of the workers in Las Vegas’s casinos. Leaders of the group, which is over half Latino, have said they are opposed to Mr. Sanders’s single-payer plan.

“This is a very difficult state for any Republican to win statewide,” said Jon Ralston, the editor of The Nevada Independent.