You know America entered World War I late. But do you know what its forces actually achieved on the Western Front? Most accounts either meticulously detail the mobilization and logistics or break down the brutal combat record, but they fail to tie both together to show the actual, cumulative impact of the United States on the war. This deeply researched military history moves beyond mobilization statistics to confront the real combat impact of two million American troops, engaging directly with the controversies historians still debate. Written by an active-duty US Navy sailor and grounded in primary archival sources, this is the evidence the argument has been missing.