The second major incident arose out of an initially peaceful protest by the Mau (literally translates as "strongly held opinion"), a non-violent popular movement which had its beginnings in the early 1900s on Savai'i and led by Lauaki Namulauulu Mamoe, an orator chief deposed by Solf. In 1909, Lauaki was exiled to Saipan and died en route back to Samoa in 1915.By the late 1920s the resistance movement against colonial rule had gathered widespread support during the mistreatment of the Samoan people by the New Zealand administration. One of the Mau leaders was Olaf Frederick Nelson, a half Samoan and half Swedish merchant. 15 - Nelson was eventually exiled during the late 1920s and early 1930s, but he continued to assist the organization financially and politically. In following the Mau's non-violent philosophy, the newly elected leader, High Chief Tupua Tamasese Lealofi, led his fellow uniformed Mau in a peaceful demonstration in downtown Apia on 28 December 1929. 16 - The New Zealand police attempted to arrest one of the leaders in the demonstration. When he resisted, a struggle developed between the police and the Mau. The officers began to fire randomly into the crowd and a Lewis machine gun, mounted in preparation for this demonstration, was used to disperse the Mau. 17 - Chief Tamasese was shot from behind and killed while trying to bring calm and order to the Mau demonstrators, screaming "Peace, Samoa". Ten others died that day and approximately 50 were injured by gunshot wounds and police batons. 18 - That day would come to be known in Samoa as Black Saturday. The Mau grew, remaining steadfastly non-violent, and expanded to include a highly influential women's branch. After repeated efforts by the Samoan people, Western Samoa gained independence in 1962 and signed a Friendship Treaty with New Zealand. Samoa was the first country in the Pacific to become independent. In 2002, New Zealand's prime minister Helen Clark, on a trip to Samoa, formally apologised for New Zealand's role in these two incidents. 19 - 20 - In July 1997, the constitution was amended to change the country's name from Western Samoa to Samoa . 21 - The U.S. territory of American Samoa protested the move, asserting that the change diminished its own identity. American Samoans still use the terms Western Samoa and Western Samoans to describe the independent State of Samoa and its inhabitants. While the two Samoas share language and ethnicity, their cultures have recently followed different paths, with American Samoans often emigrating to Hawaiʻ i and the U.S. mainland, and adopting many U.S. customs, such as the playing of American football and baseball. Western Samoans have tended to emigrate instead to New Zealand, whose influence has made the sports of rugby and cricket more popular in the western islands. Travel writer Paul Theroux noted that there were marked differences between the societies in Samoa and American Samoa. Effective 7 September 2009, the government has changed the driving orientation for motorists and Samoans now drive on the left side of the road. This brings Samoa into line with many other countries in the region. Samoa is the first country in recent years, and the first country in the 21st century, to switch to driving on the left. 22 -