Japan's leader Shinzo Abe visited Pearl Harbor. Japan's attack there in 1941 led to the USA joining World War II. Mr Abe did not apologize for the attack. He offered his thoughts to those who died. He said: "We must never repeat the horrors of war again. This is the [promise] the people of Japan have taken."
Many Japanese planes attacked Pearl Harbor, killing 2,403 people. The attack also damaged or destroyed warships. Mr Abe is the first Japanese leader to visit a special memorial. He said after WWII, Japan was destroyed and people were poor. The USA sent food and clothes. He said the two countries were now great friends.