Who claimed the largest area in the Americawhy or how?

The largest area in America was claimed by the United States through the Louisiana Purchase in 1803, which doubled the size of the nation. This acquisition was facilitated by the U.S. government’s negotiation with France, which was struggling financially and wanted to divest itself of its North American territories. The purchase added approximately 828,000 square miles of land, significantly expanding U.S. territory westward and paving the way for further exploration and settlement.