Learn how 20th century history changed world geography with this social studies book that piques students' curiosity about history through dynamic primary sources. Primary sources give students unique insights and personal connections to history. Examples of primary sources include images of Pearl Harbor, nuclear weapon testing, a pro-communism poster, and a factory assembly line. This 32-page book includes text features that help students increase reading comprehension and their understanding of the subject. Packed with interesting facts, sidebars, and essential vocabulary, this book is perfect for reports or projects.