Passage: Scientists believe the Great Polynesian Migration happened around 1500 BC as Austronesian people went on a journey using celestial navigation to find islands in the South Pacific Ocean. The first islands of French Polynesia to be settled were the Marquesas Islands in about 200 BC. The Polynesians later ventured southwest and discovered the Society Islands around AD 300.European encounters began in 1521 when Portuguese explorer Ferdinand Magellan, sailing at the service of the Spanish Crown, sighted Puka-Puka in the Tuāmotu-Gambier Archipelago. In 1606 another Spanish expedition under Pedro Fernandes de Queirós sailed through Polynesia sighting an inhabited island on 10 February which they called Sagitaria (or Sagittaria), probably the island of Rekareka to the southeast of Tahiti.Over a century later, British explorer Samuel Wallis visited Tahiti in 1767. French explorer Louis Antoine de Bougainville also visited Tahiti in 1768, while British explorer James Cook arrived in 1769.  In 1772, the Spanish Viceroy of Peru Don Manuel de Amat ordered a number of expeditions to Tahiti under the command of Domingo de Bonechea who was the first European to explore all of the main islands beyond Tahiti. A short-lived Spanish settlement was created in 1774, and for a time some maps bore the name Isla de Amat after Viceroy Amat. In 1772, Dutchman Jakob Roggeveen came across Bora Bora in the Society Islands. Christian missions began with Spanish priests who stayed in Tahiti for a year. Protestants from the London Missionary Society settled permanently in Polynesia in 1797.

Question: When did Bougainville visit Tahiti?
1768