It has been labelled a "tectonic shift", set to shake up the world of rugby union, but what is the Nations Championship, what have been the results so far, and what is the schedule this November?
Coveted defence coach Shaun Edwards has signed a contract with Argentina until after the 2027 Rugby World Cup in Australia, ending any possibility of him linking up with Steve Borthwick's England.
New Zealand outscored hosts South Africa five tries to one to win the first Test 33-16 at Ellis Park on Saturday and go one-up in the four-match series.
South Africa scraped past Argentina 17-10 in Test rugby at the possible expense of inspirational captain Siya Kolisi in Buenos Aires on Saturday.
Tomas Albornoz has been suspended for four matches after being hit with a misconduct charge following Argentina's Nations Championship defeat against England last month.
Spain head coach Luis de la Fuente has described the conduct of Argentina players after the World Cup final as "intolerable and unacceptable".
Argentina head coach Felipe Contepomi stormed out of his press conference and accused England of showing a "lack of respect" following Saturday's controversial Nations Championship clash.
We pick the standout players from the weekend as Argentina beat New Zealand for the first time ever in the Tri-Nations.
We take a look at the state of play in Argentina ahead of the 2017 Rugby Championship.
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