Patrick Renshaw 
Longman Companion to America in the Era of the Two World Wars, 1910-1945 [PDF ebook] 

Between 1910 and 1945 the United States transformed itself into a Super Power. By 1945, with rivals in Europe and Asia shattered by world war, she dominated global economic, financial and political arrangements and monopolised the atomic bomb. This new Companion to History is an indispensable guide to this critical period in US history. It includes: chronologies listing all the major events, both foreign and domestic; social and economic history, with many tables based on inaccessible data; scores of mini-biographies; listings of the major office holders; and maps.