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It also sends a message that South America keeps diverse trade and diplomatic relations even as U.S. President Donald Trump .

European Commission President Ursula von der Leyen, who head's the EU's executive branch, said “the geopolitical importance of this agreement cannot be overstated� amid revived skepticism about the benefits of free trade. As the ceremony got underway, Trump on eight European nations over their opposition to American control of Greenland.

“We choose fair trade over tariffs. We choose a productive long-term partnership over isolation,� von der Leyen declared at the ceremony attended by the presidents of Mercosur members Argentina, Uruguay and Paraguay, and by the foreign minister of the trading bloc’s biggest economy, Brazil.

“We will join forces like never before, because we believe that this is the best way to make our people and our countries prosper.�

Pushed by South America’s renowned cattle-raising countries and Europe’s industrial sectors craving new markets for cars and machines, the accord creates one of the world's largest free trade zones and makes shopping cheaper for more than 700 million consumers.

After decades of delay, the politically explosive deal still must clear one final hurdle: ratification by the European Parliament.

Powerful protectionist lobbies on both sides of the Atlantic, particularly European farmers scared of the possible dumping of cheap South American agricultural imports, have long sought to scupper the agreement. Tractor drivers clogged the streets in outrage across the continent in recent weeks and could still stall the deal's implementation.

Although the accord eliminates more than 90% tariffs on goods and services between the European and Mercosur markets, some tariffs will progressively be cut over 10-15 years and key farm products like beef will be limited by strict quotas in a bid to assuage European farmers’ fears.

Those limits, as well as safeguard measures and generous EU subsidies to cash-strapped farmers, pushed agricultural powerhouse Italy across the line earlier this month.

France, however, remains opposed to the accord, with President Emmanuel Macron worrying that farmers’ frustration with the EU could drive more voters to the country’s far right in the 2027 presidential election.

“Everything will depend on the political appetite of the European Parliament,� said João Paulo Cavalcanti, a Brazilian lawyer specializing in international trade. “That could clearly create an obstacle to approval.�