Complete the sentence about Sonderbund War with the correct year: By the Treaty of Vienna of ______, the major powers guaranteed the new Swiss Constitution and had a right to intervene if they all agreed it was necessary.

Answer and explanation

Correct answer: A. 1815

  1. Step 1: By the Treaty of Vienna of 1815, the major powers guaranteed the new Swiss Constitution and had a right to intervene if they all agreed it was necessary. Answer: 1815. Why not the others: 1830, 1807 and 1845 don't fit.

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