What you'll find in many curricula that take up coding, is code that builds upon itself.
Taking advantage of what we've done already, we branch this way and that, exploring different topics.
A rigid march through a terrain is different from exploring it. The latter job is for scouts and surveyors, the ones who map out a territory.
The marchers usually come through when preplanned routes have been paved, or call them roads. We're bringing people through at high volume at a steady pace. The route may have some known obstacles or rough patches.
Then you get the Roman soldiers and what not.
In Placed Based Education, we encourage students to learn about, and share about, their immediate neighborhood, looking for ways to contextualize what's local in contained scopes.
For example, in these videos, we're exploring Asylum District (centered around one Hawthorne Boulevard, named for the first doctor to run a mental asylum in the state of Oregon).
I use the local scene as a jumping off point to begin exploring more of American History, which includes Americans in the north asserting their Manifest Destiny over peoples (other Americans) to the south.
This pattern has a lot of inertia and we see more consequences of this ideology in our own time.
In the Youtube below, I get the wrong Roosevelt, saying "FDR" instead of "Teddy". In the subsequent Youtube, I go back over that history, fix the mistake, and take a somewhat deeper look.
