Final answer:
The USS Lexington and the USS Yorktown were the two US ships involved at the Battle of Coral Sea. The United States lost the USS Lexington during the battle.
Step-by-step explanation:
The two U.S. ships involved at the Battle of Coral Sea were the aircraft carriers USS Lexington and USS Yorktown. Of these, the USS Lexington was lost during the battle, marking a significant but costly engagement for the United States. The Battle of Coral Sea was crucial in halting the Japanese advance towards Australia, and although the U.S. Navy suffered the loss of an aircraft carrier, it represented a strategic Allied victory by preventing Japanese expansion to the south.