The San Antonio Spurs dominated the NBA from 1999 to 2014.  They won five NBA championships during that stretch and made the playoffs all fifteen of those years.  There were many key reasons why they were able to dominate for so long.

The first reason is the greatness of Tim Duncan.  Duncan was selected as the number one overall pick in the 1997 draft, and his impact could be seen in the first game he played.  Scoring fifteen points and grabbing ten rebounds, the Spurs have found their key player for the foreseeable future.  They also hired Greg Popovich at the end of the 1996 season to be their new head coach, and he would become one of the greatest NBA coaches of all time

The Spurs immediately won fifty-six games with a rookie Tim Duncan. A thirty-six game improvement from the previous year which is an NBA record. Then went on to win the championship the following year with Tim Duncan and veteran David Robinson.  

The Spurs drafted Tony Parker and Manu Ginobili in the 1999 and 2001 NBA draft to add more talent around Duncan after David Robinson had retired.  With the trio of Duncan, Parker, and Ginobili, the Spurs won three more NBA championships within the next six years in 2003, 2005, and 2007.  

In 2011, The Spurs were looking to add more talent to their roster as the players had gotten older and were no longer at their absolute best, they traded for a rookie Kawhi Leonard.  With another star player added to the team, the Spurs took on the hardest challenge in the NBA Finals that they had faced against Lebron James and the Miami Heat.  After splitting the first two games at home in San Antonio, The Spurs would go on the road and completely dominate the Heat.  They would win games two, three, and four and end the series four games to one. Their new young star, Kawhi Leonard, would win Finals MVP for playing outstanding defense on Lebron James.

The San Antonio Spurs were one of the greatest dynasties over the fifteen years in the history of the NBA.  They were consistent every year and were always among the top few teams that were most likely to win the title.