What is the fine-grained topic of the following text: When the United States formally entered World War II in 1941, Texas escorted war convoys across the Atlantic, and later shelled Axis-held beaches for the North African campaign and the Normandy Landings before being transferred to the Pacific Theater late in 1944 to provide naval gunfire support during the Battles of Iwo Jima and Okinawa. Only return the topic.
Role of Texas in World War II