 Complete the following phrase:  The event then entered a period of great disruption. The championship was not played on a regular basis and many editions would be deemed unofficial, only to be considered valid later on by CONMEBOL. For example, Argentina would be the first and so far only team to win three consecutive titles by winning the championships of 1945, 1946 and 1947. After those three annual tournaments, the competition returned to being held every two years, then three and later four. There were even two tournaments held in 1959, one in Argentina and a second in Ecuador. During this period, some of the national teams were indifferent to the tournament. Some did not participate every year, others sent lesser teams; in the 1959 edition held in Ecuador, Brazil entered a team from the state of Pernambuco. Bolivia won for the first time when it hosted in 1963, but was defeated in the first game of the 