This volume includes a Spanish translation of the Manifesto of the Earth Federation by Glen T. Martin together with a Spanish version of the Constitution for the Federation of Earth. The Manifesto was approved by the Provisional World Parliament as an official statement of the Parliament. It contains an in-depth analysis of the present world system showing how and why there is growing poverty, environmental destruction, war, and other disastrous tendencies. It shows the ways in which the Earth Constitution can address these problems to make the Earth a decent home for all persons. The Constitution was written through a process of four global Constituent Assemblies and reached its final form at the Fourth Assembly in Troia, Portugal in 1991. Together, these documents provide a compelling road map for humanity to move into a decent, just, and sustainable future.