Native Science understands that nature is technology – a compost pile is a massively-tested super-applicable multifaceted waste management system resulting from four billion years of research and development where you put food waste in and get high-yield fertilizer out and the whole process is carbon neutral!
I imagine a Steampunk North America (Turtle Island) in which the buffalo population wasn’t deliberately eradicated for genocidal purposes and which thus still enjoys the resources of vast areas of tall grass prairie (you need buffalo to have prairie as much as you need prairie to have buffalo because many seeds will not germinate correctly or thrive without passing through a buffalo’s digestive system unless human intervention is applied). I imagine a Turtle Island in which deforestation is severely curtailed and vast areas of old-growth forest are deliberatly maintained. I imagine city architecture utilizing rammed-earth walls and green roofs on large communal buildings, and time-tested local building technologies on smaller, private residences. I imagine populous cities designed for walkability and communal pedestrian culture. I imagine a North America in which the Black Hills are not defaced with gigantic carved graffiti of doofy white dudes.
By the 19th century in my alternate timeline, Turtle Island has a thriving, technologically advanced pan-Indian culture, a collective of independent nations with distinct regionalisms that has a UN-like organization to engage with the global community. A group of nations that meets Europe as equals and trades technology and cultural influences as such.