Human civilization is at a crossroads where it cannot grow as it must invest too much to keep itself afloat. And it may not stay afloat for very long. Something needs to happen for humanity to strike boldly forth again, and many are of the mind that a return to Earth is in order.
Military resources of the remaining superpowers are still tied-up guarding against each other and tending to the space settlements. But traders coalitions have arisen from each superpowers' sphere of influence to collate and direct economic efforts to try and reverse the downward trend humanity has fallen into. It is these organizations that have taken it upon themselves to spearhead the effort to recolonize Earth.
Although before the time of Earth's destruction the United States' influence had waned notably due to its diminished geographic presence on Earth, the cataclysmic event played into its favor as the United States' resurgent space programs in the late 2000s had propelled its claims and influence there. Today, it stands strong as one of the most powerful and technologically-advanced influence blocs. The traders coalition that taps into its influence bloc- the United Traders Coalition- has identified some of the most stable terrain on Earth to establish atmospheric processors on, in order to help start the process of cleansing and revitalizing Earth's decimated atmosphere. Among these locations are the Southwest United States, where the United Traders Coalition has decided to concentrate the majority of its starting efforts.
The United Traders Coalition finances start-up companies and provides them with contracts to mine resources from Earth, to protect resource mining and atmospheric processing, and to prepare Earth for settlement. The United Traders Coalition acts as the primary intermediary for supplying these companies, efficiently acquiring surplus from the United States and Canadian militaries while financing development of specialist solutions as necessary. Through these efforts, the United Traders Coalition seeks to make the Earth a prosperous home for humanity once again, no matter the cost.