Understand the Problem
The question appears to be gathering information about the United States Congress, including its structure, processes, and committees. It looks like notes or an outline related to a study of congressional systems rather than a specific question.
Answer
10 years
The blank in the first statement is filled with '10'.
Answer for screen readers
The blank in the first statement is filled with '10'.
More Information
The U.S. conducts a national census every 10 years to collect population data and apportion congressional districts accordingly.
Tips
A common mistake is confusing the frequency of congressional elections (every 2 years) with the census frequency.
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