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An expert explains the reasons a technology first used during the French Revolutionary Wars remains so in demand today.

Switzerland nation has not fought in an international war since 1815, when it adopted neutrality at the Congress of Vienna which ended the French Revolutionary Wars.

In late 1791 and early 1792, on the eve of the French Revolutionary Wars, Queen Marie Antoinette engaged in a secret correspondence with her confidant and rumored lover, Swedish Count Axel von Fersen.

"Now when I turn on the TV at night, dozens of stations are airing dramas about revolutionary wars," a Beijing resident told BBC Chinese.

The first debates on interpreting the Constitution took place not in the courts but in Congress, over questions like the removal power of the president, whether Congress had the authority to issue charters of incorporation, whether the president could unilaterally declare American neutrality in French revolutionary wars and whether the House of Representatives had a right to review presidential papers related to the negotiation of the Jay Treaty.