Abigail, Jacob, Zack, and Bo travel back in time to meet George Washington and try to convince the stubborn general to continue fighting the Revolutionary War in Valley Forge.
Abigail and her third grade friends travel back to the past once again on a mission to convince Sacagawea, a teenage Native American who served as a guide for Lewis and Clark, not to give up on her dream.
Abigail and her friends travel to the past on an urgent mission when their time-traveling teacher returns from the mid-nineteenth century to report that President Abraham Lincoln is thinking about quitting, leaving the issue of slavery unresolved.
