Answer:
Withdrawal from the European Union is the legal and political process whereby an EU member state ceases to be a member of the Union. Article 50 of the Treaty on European Union (TEU) states that "Any Member State may decide to withdraw from the Union in accordance with its own constitutional requirements".
A collapsed euro would likely compromise the Schengen Agreement, which allows free movement of people, goods, services, and capital. Each member country would need to reintroduce its national currency and the appropriate exchange rate for global trade.
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