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World History
 Standard 24.Understands the expansion of states and civilizations in the Americas between 1000 and 1500
  Level IV [Grade 9-12]
   Benchmark 4
Knows the technology (e.g., engineering of roads, bridges, irrigation systems) and urbanism of the Incas (in Cuzco), the Aztecs (in Tenochtitl n), and of North American mound-builders
    Knowledge/skill statement 2
Understands the use of irrigation systems by the Incas (in Cuzco), the Aztecs (in Tenochtitlán), and of North American mound builders
Citation reference
BD = benchmark, declarative
BP = benchmark, procedural
BC = benchmark, contextual
K = Knowledge
S = Skill
P = Performance

1st letter/number of each code in parentheses:
B   NCHS: Basic Edition
L   Lessons from History
W   NCHS: World History, expanded edition

2nd letter code :
E = Explicitly stated in document
I = Implicit in document

Page number of the cited document