The opening of the Panama Canal enabled U.S. warships to transfer between which two oceans?

The correct answer is the Atlantic and Pacific Oceans. The opening of the Panama Canal in 1914 created a crucial maritime route that significantly shortened the travel distance for ships moving between the east and west coasts of the United States. Previously, naval vessels had to navigate around the southern tip of South America via the treacherous Strait of Magellan or the longer route around Cape Horn. By providing a direct passage, the Panama Canal enhanced the operational flexibility of U.S. naval forces, allowing for quicker deployment and logistics support between the two major oceans.

The other options do not accurately reflect the geographical significance or the specific routes provided by the canal. The Indian and Arctic Oceans, while important in their own rights, are not connected by the Panama Canal, nor do they play a role in the U.S. strategic naval operations facilitated by this canal. Similarly, the Pacific and Arctic Oceans and the Atlantic and Indian Oceans do not pertain to the specific maritime access that resulted from the construction of the Panama Canal. The answer highlights the canal's impact on naval strategy and maritime commerce.