REA's Essentials provide quick and easy access to critical information in a variety of different fields, ranging from the most basic to the most advanced. As its name implies, these concise, comprehensive study guides summarize the essentials of the field covered. Essentials are helpful when preparing for exams, doing homework and will remain a lasting reference source for students, teachers, and professionals. United States History: 1877 to 1912 includes the New Industrial Era, the reaction to corporate industrialism, the emergence of a regional empire, the Spanish-American War, the Americanization of the world, Theodore Roosevelt and progressive reforms, the regulatory state and the ordered society, and the election of Woodrow Wilson.