1. Historians study the past to
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O A. learn more about geography.
O B. design a better family album.
O C. better understand who we are.
O D. create primary sources for people.

Match each model with its name and the name of the scientist who created it.

For each statement, select whether it is true of the central pacific railroad, the union pacific railroad, or both. it began in nebraska. it began in california. it went through the sierra nevada. it went through the rocky mountains.

Which of the following best describes the difference between a nation-state and a city-state?