United States History

Standard 31 : Understands economic, social, and cultural developments in the contemporary United States

Reference code: BE,129;AE,237

1st letter/number of each code in parentheses:
A	NCHS: U.S. History, Expanded Edition
B	NCHS: Basic Edition
L	Lessons from History
N	NAEP: Framework 2006

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

Number:
Page number of the cited document

Mid-continent Research for Education and Learning