Voyage to the Stars

As the world fights for survival in over 200 years in the future. Communist countries have joined forces with other countries forming one communist force. Attacking the United States and other countries.As the Earth is reduced to a nuclear hell hole where humans can't survive any more.As the countries voyage out in space with a fleet of space ships leaving communist countries on the earth .As NASA discovered in their telescopes in space a planet though to be able to support human life it's the fleets destination. It will take them 75 years to reach the planet. If it can support human life?