Grade 3 Spring History - World Cultures in Depth and Toolmaking Across Time: Four Cultures, Six Source Types, and the Story of How Humans Have Solved Problems
Lesson 15 50 min hist.g3.s.lesson_15

Trade Networks and Cultural Diffusion - Tracing One Innovation Across Time and Space

Skills targeted
Objectives
  • Students engage with the lesson 15 content described in title and narrative.
  • Students apply unit-wide routines (Cultural Care Promise, present-tense protocol, OWN-VOICE CHECK) to the lesson 15 content.
Vocabulary
trade networkcultural diffusionoriginatordiffusion pathcaravanchasquiSilk RoadsPacific exchange

Lesson plan

Warm-up

5 min

Calendar Circle + Cultural Care Promise + review the four cultures studied

Teacher moves
  • Lead routine standing
  • Affirm continuity with prior lessons

Direct instruction

15 min

Show MG-9 with all four networks visible. Walk through each: INCA ROAD (Qhapaq Nan) - state-built; TRANS-SAHARAN - merchant-camel caravan; SILK ROADS - merchant routes connecting Tang/Song China to West Asia and Africa; POLYNESIAN VOYAGING - wayfinder-led ocean voyaging. Define CULTURAL DIFFUSION. Demonstrate the diffusion-trace routine with PAPER: started in China (Cai Lun, 105 CE); moved west via Silk Roads; reached Baghdad (8th century); reached Cordoba (10th century); reached Europe (12th-13th centuries). CRITICAL FRAMING: refuse 'European discovery' for potato (Andean), gold-coinage from West African gold, star-navigation (Pacific Islander).

Key examples
  • Notice: 'encounter' and 'discover' are very different words. The historian uses 'encounter' carefully.
    model NO. The potato was domesticated by Andean peoples thousands of years before any European saw one. Europeans ENCOUNTERED the potato in the Andes; they did not invent it. The potato spread from the Andes to Spain in the 16th century and then around the world.
    prompt Did Europeans 'discover' the potato?
Checks for understanding
  • Name TWO innovations and their named originators. Why does the diffusion routine matter?
Sourcework

Children examine MG-9 as a cartographic source showing all four networks together. They use diffusion-trace cards to follow ONE innovation along ONE network.

Media
M-3-S-ECO-15-A Chart
MG-9 36x36-inch laminated chart showing four named trade-network maps superimposed on a world outline (Inca road / Trans

MG-9 36x36-inch laminated chart showing four named trade-network maps superimposed on a world outline (Inca road / Trans-Saharan caravan / Silk Roads / Polynesian voyaging). Children physically trace one innovation along one network during guided practice.

MG-9 Chart
Mounted on classroom wall at child-eye-height. The intentional FOUR-NETWORK framing teaches that trade networks operate

Mounted on classroom wall at child-eye-height. The intentional FOUR-NETWORK framing teaches that trade networks operate at many scales (continental, intercontinental, oceanic) and on many cultural logics (state-built for Inca; merchant-caravan for Trans-Saharan; merchant-caravan + maritime for Silk Roads; wayfinder-voyaging for Polynesian). Children reference this anchor in lesson 15 and trace ONE innovation along ONE network as their cultural-diffusion exercise.

Guided practice

15 min
Tasks
  • In pairs, choose ONE diffusion-trace card (paper / gold / potato / breadfruit). Trace its path on MG-9 with finger or moveable arrow.
    scaffold Diffusion-trace cards have sentence frames pre-printed
  • Write a 5-sentence Diffusion Trace using the frame.
    scaffold Sentence frame at the table; teacher checks
Media
M-3-S-ECO-15-B Chart
Set of 4 laminated 5x7 cards: PAPER (Cai Lun c. 105 CE China -> Silk Roads -> Baghdad -> Cordoba -> Europe); GOLD (West

Set of 4 laminated 5x7 cards: PAPER (Cai Lun c. 105 CE China -> Silk Roads -> Baghdad -> Cordoba -> Europe); GOLD (West African mining communities -> Trans-Saharan caravan -> Cairo -> Venice); POTATO (Andean peoples thousands of years BCE -> Spanish encounter 16th century -> Spain -> world); BREADFRUIT (Pacific Islanders -> Polynesian voyaging -> Hawaii, Aotearoa, Rapa Nui). Each card has the 5-sentence Diffusion Trace frame printed.

Formative assessment

3 min
Exit ticket
  • Name ONE innovation and trace where it moved. Who is the originator?
scoring Full sentences with required elements = mastery; partial = practicing; missing key element = reteach

Closure

Moves
  • Restate: 'Cultural diffusion has originators - never anonymous'
  • Preview lesson 16's cross-cultural corroboration work

Homework

10 min
Tasks
  • Discuss today's lesson with a caregiver and record 2 sentences.

Exercises in this lesson

hist.g3.s.ex_37
Trace ONE innovation across one trade network. Name the originator, the path, and at least 2 stops along the way.
 diffusion trace · diff 3
hist.g3.s.ex_38
Did Europeans discover the potato? Explain your answer in 2 sentences.
 open response · diff 4

Differentiation

Scaffolds
  • Sentence frames in pair work
  • Picture support for unfamiliar vocabulary
  • Pronunciation audio for non-English terms
Extensions
  • Stretch students extend the core task with a comparison to another culture
  • Stretch students draft a thank-you note for one source author
English Learners
  • Pre-teach key vocabulary with picture cards
  • Allow pair-work via discussion or gesture
Ieps 504s
  • Adult scribe for written work
  • Audio replay for any recording

Teacher notes

Lesson 15 is the unit's central cultural-diffusion lesson. The named-originator rule refuses the colonial framing of innovations as 'European discoveries.' Use 'encounter' for European-American contact with already-existing innovations. Trauma-informed note: 1492+ contact involved both botanical exchange AND violence/disease/colonization - acknowledge both without dwelling at G3.