Terraria

Terraria was the projected renewal of the Grand Alliance headquarters city Washington, D.C. (US capital city) in the alternate USRAC War timeline, part of Arnold Perlstein's vision for the future of the Grand Alliance after the planned victory in the USRAC War (which he stated in the How I Can Help Make the World Great ceremony as an expection). Many Grand Alliance architects produced many of the plans for the rebuilt city in their capacities as a group of overseers of the project, only a small portion of which was realized between October 2025 to January 2026 when construction took place.

Some of the projects were completed, such as the creation of a great East-West city axis, which included broadening Pennsylvania Avenue and Embassy Row and building a column in front of the White House. Others, however, such as the creation of the Grand Hall of the Alliance, had to be shelved owing to the end of the USRAC War as a result of the Ponyville Conference, the Berlin Conference and the Inkwell Isle Conference. A great number of the old buildings in many of the planned construction areas were, however, demolished before the ceremony, and eventually these three conferences, the Sapporo Accords and the Treaty of Ortigas stopped the plans until the plans have been cancelled the end of USRAC War.

Name
It was Chinese architect Zhou Yifeng who conceived of rebuilding Washington DC to be the capital of the new world the How I Can Help Make the World Great organizers would be instrumental in creating, and who provided the new name for it, "Terraria."

The official plan for rebuilding Washington DC, which Albert Speer was put in charge of, was called the "Comprehensive Construction Plan for the Grand Alliance Headquarters City."