Book excerpt: The evolution of the United States from a late-18th century coalition of rebel British colonies to a 21st century global superpower was shaped by several forces. As the nation expanded its boundaries after the Treaty of Paris confirmed independence from Great Britain in 1783, it acquired a rich variety of resources – coal, fertile soils, forests, iron ore, oil, precious metals, space, and varied climates as well as extensive tracts of territory. Technological innovations, such as the cotton gin and steam power, enabled entrepreneurs to exploit those resources and create wealth. Federal and state legislators provided environments in which the economy could flourish, and military strategists kept the country safe from external attack. Diplomats negotiated commercial agreements with foreign governments and cultivated multinational alliances that strengthened freedoms. Through its focus on the people and places that shaped the country’s economic and political development and its detailed accounts of the processes that enabled the U.S. to expand across the continent Historical Dictionary of the United States contains a chronology, an introduction, and an extensive bibliography. The dictionary section has more than 400 cross-referenced entries on important personalities as well as aspects of the country’s politics, economy, foreign relations, religion, and culture. This book is an excellent resource for students, researchers, and anyone wanting to know more about the United States.