Despite its similar scientific botanical name, not a sister-species to
giant sequoia Sequoiadendron giganteum.
But it is a close cousin, with both trees being in the same
sequoia subfamily Sequoioideae
in
cypress / juniper / redwood family Cupressaceae
in
🌲︎ conifer order Pinales.
And both trees share being the 🏛🌲︎ state tree of California.
Native to a thin strip along the Pacific Ocean, in the 🗻︎ coastal mountains of central and northern California, extending a bit into southwestern Oregon.
🗺 Map by county (🇺🇸 USA-48)
(color key),
🗺 map (scroll down),
🗺 map (North America, Central America). 
This tree's range was much larger:
• to Los Angeles during the Last Glacial Period (∼115,000–11,700 years ago), and
• across 🇪🇺 Europe and Asia before the Quaternary ice ages (before 2.58 million years ago).
Planted elsewhere 🌐︎ around the globe:
A giant sequoia tree is thriving in a surprising place: Northern Michigan.
Said to get much of its annual 💦︎ water and fixed nitrogen
needs from the local ☀︎🌫 summer fog, collecting on the tree's small needles, with the water absorbing directly through its needles or bark, or dripping toward its roots.
Uses by native peoples
(Ethnobotany database)
Its 🪵 wood is used to make 🎸︎ ukuleles and mandolins, and for other uses needing durability.