Countries join alliances, or entities such as the European Union, because these groups make the benefits and obligations of membership as unambiguous as anything in international relations can be. For Germany and South Korea, however, relationships with historic allies — NATO and the United States, respectively — appear to be changing before our eyes.

It took more than 120 minutes and a goal in extra time, but Germany emerged as the World Cup champion with a 1-0 win over Argentina on Saturday. Once the game ended, the Christ the Redeemer statue in Rio de Janeiro was illuminated in German colors, and Twitter was abuzz with responses to the tournament’s final game.

Even normally quiet streets were electrified early Monday by Germany’s dramatic 1-0 win of the World Cup in extra time, a victory that symbolized, at least to fans, not just the country’s dominance of Europe, but its global prominence. Car horns and vuvuzelas honked, and fireworks and firecrackers exploded. On the Kurfuerstendamm, the gleaming street of stores and restaurants that was the symbol of West Berlin during the Cold War, cars quickly jammed traffic and fans draped themselves in the black, red and gold of the German flag.

Sunday’s final concluded a monthlong tournament that presented a jarring contrast between Brazil’s hosting of the tournament and its achievement on the field. The World Cup was well organized despite fears that it would be chaotic. The Brazilian people were hospitable. The soccer was largely attractive and attacking. Some have called this the best World Cup in recent memory. Soccer became so absorbing that widespread protests - against perceived wasteful spending on the World Cup and the 2016 Rio Olympics - did not occur after undermining a warm-up tournament last year.

Germany and the United States sought on Sunday to restore vital ties badly frayed by a spying row which led to the expulsion of the CIA station chief in Berlin. Secretary of State John Kerry emerged from talks with his German counterpart Frank-Walter Steinmeier to offer reassurances that the two vital transatlantic allies remain "great friends". In a bid to lighten the atmosphere and use sports diplomacy, Kerry even wished his counterpart "good luck" in Sunday's football World Cup final when Germany will take on Argentina.

Everyone knew it would be difficult for Brazil without the injured star Neymar and the suspended captain, Thiago Silva, but nobody imagined this feeble capitulation — four goals surrendered to Germany in six minutes during a 7-1 rout in a World Cup semifinal. Early on, Brazil’s players bickered, lost their cool, then lost their fight. The country of the beautiful game was left to face a grotesque humiliation.

The 2010 World Cup in South Africa was one of the first glimpses of this new German identity on the international stage. In the eyes of many it represented a modern Germany, free from the shackles of its history, as the center of European affairs and subsequently, highlighting the changing face of race and ethnicity on the continent.

The German authorities have summoned the US ambassador in Berlin after a man was arrested on suspicion of spying. The US diplomat "was asked to help in the swift clarification" of the case, the foreign ministry said. German officials confirmed the arrest but released no other details. US-German ties were strained after allegations last year that the US National Security Agency (NSA) bugged Chancellor Angela Merkel's phone as part of a huge surveillance programme.