National Standards for History: Part Two Chapter One
National Standards for History

Developing Standards in 
United States History and World History 

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Developing Standards in United States History 
Periodization for U.S. History 
Students should understand that the periods into which the written histories of the United States or the world are divided are simply constructions made by historians trying to impose some order on what is inherently an untidy past that can be read and conceptualized in a variety of ways. In a nation of such diversity as the United States, no periodizing scheme will work for all groups. American Indian history has benchmarks and eras that sometimes but not always overlap with those of European settlers in the colonial period. For that matter, Iroquois history would have to be periodized differently from Sioux or Zuni history. African American history would have its own watersheds, such as the shift from white indentured servitude to black slave labor in the South, the abolition of the slave trade, the beginning of emigrationism, and so forth. So also with women’s history and with Mexican American history. 

Nonetheless, we believe that teachers will appreciate a periodization that attempts to blend political and social history. For this purpose, political events in United States history such as the American Revolution, the Constitution, the Civil War, Progressivism, the New Deal, and the Cold War-all of which have fairly definite beginning and end points-continue to provide breakpoints in the United States history curriculum. The industrial revolution, the labor movement, environmentalism, shifts in childrearing and family size, and so forth have no such precise beginning and end points and cut across eras defined by revolution, civil war, depression, and the like. In fact, none of the college texts in United States History that have tried in recent years to infuse social history into political and institutional history have been able to get around the general determinancy of wars and political reform movements and the indeterminancy of demographic, cultural, and social transformations. 

We have tried to overcome, in part, the difficulties inherent in periodizing history by overlapping eras to demonstrate that there really is no such thing as an era’s beginning or ending, and that all such schemes are simply the historian’s way of trying to give some structure to the course of history. The ten eras selected for periodizing United States history are presented below: 

Era 1: Three Worlds Meet (Beginnings to 1620) 

Era 2: Colonization and Settlement (1585-1763) 

Era 3: Revolution and the New Nation (1754-1820s) 

Era 4: Expansion and Reform (1801-1861) 

Era 5: Civil War and Reconstruction (1850-1877) 

Era 6: The Development of the Industrial United States (1870-1900) 

Era 7: The Emergence of Modern America (1890-1930) 

Era 8: The Great Depression and World War II (1929-1945) 

Era 9: Postwar United States (1945-early 1970s) 

Era 10: Contemporary United States (1968-present)