Poul Anderson 
Orbit Unlimited 

Seeking freedom from their oppressive government on Earth, a ragtag group of idealists embark on a perilous journey to found a new world light-years from home On a future Earth, gone are the halcyon days of the early space program, when the universe held endless promise and excitement. Overcrowded, ruled by a corrupt autocracy, and plagued by vast economic inequalities, life on Earth has become nightmarish, and the promise of a world beyond the planet is diminishing rapidly as the government begins shuttering its interstellar efforts. But for a small band of rebels called Constitutionalists, escaping into the vast universe beyond is the only hope. And so off they set for a distant planet where they can start over, building a new society on the principle of liberty, testing the very limits of human capability. Their years-long trip is not without its tribulations, from internecine conflict on the ship to ambiguous pleas from Earth to return. Their destination, an Earth-like planet called Rustum, is twenty light-years away, and through every treacherous moment of the journey they know that their most harrowing trials are yet to come when they finally reach their new home.   The story of Rustum and the Constitutionalists who settled there continues in New America.