Introduces the mathematical concept of proportions by using examples of the money and time used to build the transcontinental railroad, and provides a brief history of the railroad and its impact upon the United States.
Describes the process of the United States census, including the shift in statistics over the years, how its tabulation has changed, and why taking a census is important.
Lewis and Clark were brave explorers who traveled great distances to map and take notes on much of the country. This book delves into the exciting history of their journey. Readers will also learn how to chart data on line graphs as they observe the number of miles the explorers traveled each month.