The vote in the United Kingdom on Thursday to leave the European Union, which led to a resignation announcement by Prime Minister David Cameron, already is giving others ideas.
"The mere fact that a country like Great Britain is holding a referendum on whether to leave the EU signals the failure of the European Union," Beppe Grillo said.
He's the leader of the anti-establishment Five Star movement in Italy, which wants the euro to be split. The London Telegraph reported the objective is to have "one for the rich north and one for the south."
The report said that, already, voters in France and the Netherlands are joining those in Italy demanding their own votes on European Union membership.
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The report said Britain's exit could spark a "contagion" of referendums, creating stress for EU leaders who are trying to hold together the nearly 50-year-old coalition.
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German leaders, the Telegraph reported, were discounting the negative impact, saying that taking retribution against the U.K. through trade and business would be counterproductive.
"Imposing trade barriers, imposing protectionist measures between our two countries – or between the two political centers, the European Union on the one hand and the UK on the other – would be a very, very foolish thing in the 21st century," said Markus Kerber, representing a German industrial organization.
Donald Trump, the presumptive GOP nominee for president, agreed.
"The Trump administration pledges to strengthen our ties with a free and independent Britain, deepening our bonds in commerce, culture and mutual defense. The whole world is more peaceful and stable when our two countries – and our two peoples – are united together, as they will be under a Trump administration," he said in a statement.
Front National leader Marine Le Pen in France also called for her nation's own vote, saying it "has a thousand more reasons" than the U.K.
Geert Wilders, a conservative Dutch leader, also is demanding a referendum, saying, "We want be in charge of our own country, our own money, our own borders, and our own immigration policy."
Further, the BBC was reporting that a referendum in Scotland regarding leaving the U.K. is likely.
The report said Scottish First Minister Nicola Sturgeon, a critic of the decision to leave the European Union, cited Scotland's vote to remain in the EU, which that was nullified by the vote in England.
She announced plans to start legislation to allow the next independence vote.
"It is … a statement of the obvious that a second referendum must be on the table, and it is on the table. … I intend to take all possible steps and explore all possible options to give effect to how people in Scotland voted – in other words to secure our continuing place in the EU, and in the single market in particular," she said.
The vote is an "explosive shock," said French Prime Minister Manuel Valls. "At stake is the breakup pure and simple of the union. Now is the time to invent another Europe."
Reuters reported Sinn Fein, the Irish nationalist party, also called for a vote on whether the United Kingdom should be broken up.
The Telegraph also said a poll last month found nearly half of voters in eight big EU nations want a vote on whether to remain. One third of the respondents said they would leave if they could.
The report noted that "mainstream politicians" in Sweden and Denmark currently are "trying to stamp out" calls for their countries to follow Britain's lead.
"We belong to the EU and I am not operating on [the belief] that we should have a referendum on that basic question," Danish Prime Minister Lars Loekke Rasmussen told the Telegraph.
Sweden's prime minister, Stefan Löfven, said, "In Sweden, membership of the EU is firmly anchored."
Agence France-Presse reported German Chancellor Angela Merkel was warning about the risks of splitting Europe even further.
"There is no doubt that this is a blow to Europe and to the European unification process," she said in the report.
But she said the remaining members must "calmly and prudently analyze and evaluate the situation, before making the right decisions together."