Question
Where do these trees originate?

Answer
These are hybrids. A "hybrid" plant is produced when pollen of one species is used to fertilize flowers of another species. A hybrid poplar is a tree resulting from the combining, either naturally or artificially, of various poplar species into a hybrid.
Hybrid poplars (Populus spp.) are among the fastest-growing trees in North America and well suited for certain conditions. Poplar hybrids are not desirable in many landscapes but can be of major importance under certain forestry conditions.

Where Did the Hybrid Poplar Come From?:
Members of the willow family, hybrid poplars are crosses between North America's cottonwoods, aspens and Europe's poplars. Poplars were first used as windbreaks for European fields and hybridized in Britain in 1912 using a cross between European and North American species.
Planting of hybrid poplar for profit started in the 1970s. Forest Service's Wisconsin lab led in U.S. hybrid poplar research. The Poplar has restored its reputation by offering a new source for alternative fuels and fiber.
Populus x canescens 'Tower'
Tower Poplar