"In mid-1860s, two railroad companies had a huge job in front of them: building the transcontinental railroad. The railroad would run from east to west across the United States. As the grueling work began, there were many choices to make. Now the choices are yours. Would you rather blast rock to lay track in the Sierra Nevada mountain range or build bridges across raging rivers in the Great Plains? Would you rather sleep in a cold mountain tunnel...

"In 1804, Meriwether Lewis, William Clark, and their team set out on an exciting yet challenging expedition into the American West. They faced many difficult choices along the way. Now the choices are yours. Would you rather discover new animals or new plants, both of which could cause you harm? Would you rather be caught in a flash flood or a blinding snowstorm? Would you rather risk crossing rugged mountain terrain or going down rapids in a canoe?...

"In May 1607, English settlers stepped off their ship in North America. They were about to start the first permanent English settlement in North America. They endured many hardships and made many tough choices in the new land. Now the choices are yours. Would you rather suffer from intestinal problems after becoming infected with dysentery or have bleeding gums after getting scurvy? Would you want to work as a blacksmith or tend the tobacco fields?...

"In the early 1800s, thousands of pioneers made a long, perilous westward journey from Missouri to New Mexico. They paved the way for more settlers looking to start a new life in the West. They endured many hardships and made many tough choices. Now the choices are yours. Would you rather get bitten by a poisonous snake or suffer from cholera? Would you take the longer route across mountains with more available water? Or would you take the shorter...