By the turn of the century, there were enough college teams in the east of the U.S. that the first games between different colleges could be played. Although his sport continuously grew, Naismith long regarded his game as a curiosity and preferred gymnastics and wrestling as better forms of physical education. However, basketball became a demonstration sport at the 1904 Games in St. Louis, USA. As the Basketball Hall of Fame reports, Naismith was not interested in self-promotion nor in the glory of competitive sports. Instead, he was more interested in his physical education career, receiving an honorary PE Masters degree in 1910, patrolled the Mexican border for four months in 1916 during World War I, travelled to France, published two books ("A Modern College" in 1911 and "Essence of a Healthy Life" in 1918) and became an American citizen in 1925.