French Guiana Map for The start of WORLD WAR II (1939 45) marks the entry of women onto the stock floor. The post-war boom saw the market recover and a push to include more middle-class Americans in stock investing. In 1955, President Dwight D. EISENHOWER had a heart attack, prompting large sell-offs at the NYSE. In 1956, the postwar boom and Cold War environment provided impetus to add another addition to the NYSE at 20 Broad Street. The assassination of President John. F. French Guiana Map 2016.