Romania and Bulgaria signed the European Union’s Treaty of Accession, the last step to joining the Union.
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British Prime Minister David Cameron resigned after failing to prevent Brexit.
The EU declared that single-use plastics would be banned by 2021.
The UK's prime minister Boris Johnson compared himself to The Hulk in his efforts to steer the country out of the European Union.
France voted against ratifying the proposed Constitution of the European Union.
The people of Estonia voted to approve joining the European Union.
