U.S. History IThinking Like a HistorianD2.His.14.9-12

Causes, Effects and Change Over Time

Big events usually have several causes, long-term and short-term, and several effects; historians also ask what changed and what stayed the same.

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Once events are in order (Dates, Centuries and Periods), historians ask the big questions: why did this happen, what did it lead to, and what changed or stayed the same? These are the reasoning skills behind nearly every essay question in U.S. history.

Key idea

Big events usually have several causes: long-term causes (conditions that built up over years) and short-term causes or triggers (the sparks just before). They also have several effects, some intended and some not.

Why it works

A spark only starts a fire where there is fuel. The shots at Lexington in April 1775 did not cause the Revolution by themselves; a hundred and fifty years of colonial self-government, new British taxes after 1763 and ten years of protest had built up the fuel. Separating long-term conditions from short-term triggers explains both why something happened and why then.
Causes and effects of the American Revolution. Sort, then Check.

Worked example: Long-term or short-term?

Is "Britain's war debt after 1763" a long-term or short-term cause of the Revolution?
  1. Ask how far before 1775 it began: about twelve years.
  2. Ask what it set in motion: new taxes (1764 to 1767) and protests.
  3. It is not the spark itself, but it is much closer than the century of self-government.

Answer: A medium-to-short-term cause: it led directly to the taxes that started the quarrel. Historians may label it either way; what matters is explaining how it led to the war.

Worked example: Did it cause it?

The Great Awakening (1730s and 1740s) came before the Revolution (1775). Did it cause the Revolution?
  1. Coming before is not enough: many things came before 1775.
  2. Look for a link: the Awakening taught many colonists to question established church leaders and to choose for themselves.
  3. Then weigh it: historians debate how much that habit carried over into politics.

Answer: It may be one long-term influence among several, but "it came first" alone proves nothing.

Historians also study continuity and change over time. After the Revolution, the new states wrote constitutions and some Northern states began to end slavery (change); most states still let only men who owned property vote (continuity). Asking both questions keeps the picture honest.

Common mistake

The two classic errors: naming one cause for a big event, and assuming that whatever came just before an event caused it (logicians call this "after this, therefore because of this"). Check for a link you can explain: how, step by step, did the cause lead to the effect?

Practice

Pass with 3 right answers, the last 2 in a row. Each right answer earns 2 XP.

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Sources and further reading

  • AP United States History Course and Exam Description (College Board): historical thinking skills and Periods 1–3
  • C3 Framework for Social Studies State Standards (NCSS, 2013), Dimension 2, History
  • OpenStax, U.S. History (Rice University, 2014), Chapter 5, Imperial Reforms and Colonial Protests, 1763–1774
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