Problem: Samurai:

During the Tokugawa shogunate, samurai increasingly became courtiers, bureaucrats, and administrators rather than warriors. With no warfare since the early 17th century, samurai gradually lost their military function during the Tokugawa era (also called the Edo period). By the end of the Tokugawa era, samurai were aristocratic bureaucrats for the daimyo, with their daisho, the paired long and short swords of the samurai (cf. katana and wakizashi) becoming more of a symbolic emblem of power rather than a weapon used in daily life. They still had the legal right to cut down any commoner who did not show proper respect kiri-sute gomen (斬り捨て御免?), but to what extent this right was used is unknown. When the central government forced daimyos to cut the size of their armies, unemployed rōnin became a social problem.

When had samurai last been used in battle?
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A: the early 17th century


Problem: Estonia:

After the decline of the Teutonic Order following its defeat in the Battle of Grunwald in 1410, and the defeat of the Livonian Order in the Battle of Swienta on 1 September 1435, the Livonian Confederation Agreement was signed on 4 December 1435. The Livonian Confederation ceased to exist during the Livonian War (1558–82). The wars had reduced the Estonian population from about 250–300,000 people before the Livonian War to 120–140,000 in the 1620s. The Grand Duchy of Moscow and Tsardom of Russia also attempted invasions in 1481 and 1558, both of which were unsuccessful .

What event preceded the decline of the Teutonic Order?
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A: the Battle of Grunwald


Problem: Mali:

In January 2012 a Tuareg rebellion began in Northern Mali, led by the National Movement for the Liberation of Azawad. In March, military officer Amadou Sanogo seized power in a coup d'état, citing Touré's failures in quelling the rebellion, and leading to sanctions and an embargo by the Economic Community of West African States. The MNLA quickly took control of the north, declaring independence as Azawad. However, Islamist groups including Ansar Dine and Al-Qaeda in the Islamic Maghreb (AQIM), who had helped the MNLA defeat the government, turned on the Tuareg and took control of the North with the goal of implementing sharia in Mali.

The embargo of the Economic Community of West African States imposed what type of punishment? 
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A: sanctions


Problem: Nigeria:

After Babangida survived an abortive coup, he pushed back the promised return to democracy to 1992. Free and fair elections were finally held on 12 June 1993, with a presidential victory for Moshood Kashimawo Olawale Abiola. Babangida annulled the elections, leading to mass civilian violent protests which effectively shut down the country for weeks. Babangida finally kept his promise to relinquish office to a civilian-run government, but not before appointing Ernest Shonekan as head of the interim government. Babangida's regime has been considered the most corrupt, and responsible for creating a culture of corruption in Nigeria.

Babangida's reaction to the election results caused violent protests for how long?
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A:
weeks