| 1940 |
Ernest Hemingway writes For Whom the Bell Tolls. |
| 1940 |
W.Alton Jones becomes President of Cities Service. |
| 1940 |
Cities Service begins stripping itself of 166 utility subsidiaries in compliance with the Public Utilities Holding Act of 1935. |
| 1940 |
The now famous sign is erected in Kenmore Square in Boston. The sign, which was replaced with the CITGO logo after its creation in 1965, has become a landmark, familiar to Boston Marathon participants and Boston Red Sox fans. |
| 1940 |
Engineer Peter Carl Goldmark introduces the first television that successfully produces clear color images. |
| 1941 |
Cities Service buys the remaining shares of the Indian Territory Illuminating Oil Company. |
| 1941 |
The Japanese bomb Pearl Harbor, plunging the United States into World War II. |
| 1942 |
Construction begins on the Cities Service Refinery at Lake Charles, LA, at an estimated cost of $72 million. |
| 1942 |
The "Rosie the Riveter" publicity campaign persuades millions of American women to join the workforce. |
| 1942 |
SS Cities Service Empire, an oil tanker owned by Cities Service, is sunk by a German U-boat off the Florida coast. |
| 1943 |
French naval officer and marine explorer Jacques-Yves Cousteau and French engineer Émile Gagnan perfect the aqualung-the predecessor to scuba tanks. |
| 1943 |
Cities Service completes construction of "the Big Inch"-the biggest, longest pipeline ever-to help supply petroleum products to the war effort. |
| 1944 |
Congress passes the GI Bill, a bill guaranteeing various benefits, including education allowances and home, farm, and business loans, for military service veterans. |
| 1944 |
Lake Charles Refinery goes into full operation-the world's largest high octane aviation gasoline refinery. |
| 1944 |
Cities Service refineries process 53 million barrels of crude oil to fuel the war effort. |
| 1945 |
By the end of World War II, Cities Service fleet of oil tankers had delivered 32 million barrels of oil to military forces around the globe. |
| 1945 |
First atomic bombs dropped on Japan. |
| 1945 |
World War II ends. |
| 1946 |
The 80-feet long and 8-feet high computer ENIAC is built. |
| 1946 |
Cities Services partners with other oil companies to form joint exploration and production company in the Gulf of Mexico. |
| 1947 |
Tennessee Williams writes A Streetcar Named Desire. |
| 1948 |
Milton Berle becomes the first major American television star as Uncle Miltie. |
| 1949 |
The North Atlantic Treaty Organization (NATO) is formed. |
| 1949 |
The Cit-Con Lubricants and Wax Refinery, a joint venture between Cities Service and Conoco is built. It is 65 percent owned and operated by Cities Service. |