Problem: Strasbourg:

In 1919, following the Treaty of Versailles, the city was restituted to France in accordance with U.S. President Woodrow Wilson's "Fourteen Points" without a referendum. The date of the assignment was retroactively established on Armistice Day. It is doubtful whether a referendum in Strasbourg would have ended in France's favour since the political parties striving for an autonomous Alsace or a connection to France accounted only for a small proportion of votes in the last Reichstag as well as in the local elections. The Alsatian autonomists who were pro French had won many votes in the more rural parts of the region and other towns since the annexation of the region by Germany in 1871. The movement started with the first election for the Reichstag; those elected were called "les deputes protestataires", and until the fall of Bismarck in 1890, they were the only deputies elected by the Alsatians to the German parliament demanding the return of those territories to France. At the last Reichstag election in Strasbourg and its periphery, the clear winners were the Social Democrats; the city was the administrative capital of the region, was inhabited by many Germans appointed by the central government in Berlin and its flourishing economy attracted many Germans. This could explain the difference between the rural vote and the one in Strasbourg. After the war, many Germans left Strasbourg and went back to Germany; some of them were denounced by the locals or expelled by the newly appointed authorities. The Saverne Affair was vivid in the memory among the Alsatians.

Who had vivid memories of the Saverne Affair?
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A: Alsatians

Problem: Energy:

In particle physics, this inequality permits a qualitative understanding of virtual particles which carry momentum, exchange by which and with real particles, is responsible for the creation of all known fundamental forces (more accurately known as fundamental interactions). Virtual photons (which are simply lowest quantum mechanical energy state of photons) are also responsible for electrostatic interaction between electric charges (which results in Coulomb law), for spontaneous radiative decay of exited atomic and nuclear states, for the Casimir force, for van der Waals bond forces and some other observable phenomena.

What results in Coulomb law?
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A: electrostatic interaction between electric charges

Problem: Federalism:

In the United States, federalism originally referred to belief in a stronger central government. When the U.S. Constitution was being drafted, the Federalist Party supported a stronger central government, while "Anti-Federalists" wanted a weaker central government. This is very different from the modern usage of "federalism" in Europe and the United States. The distinction stems from the fact that "federalism" is situated in the middle of the political spectrum between a confederacy and a unitary state. The U.S. Constitution was written as a reaction to the Articles of Confederation, under which the United States was a loose confederation with a weak central government.

On the political spectrum, where does federalism stand?
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A: federalism" is situated in the middle of the political spectrum between a confederacy and a unitary state

Problem: Tucson, Arizona:

In general, Tucson and Pima County support the Democratic Party, as opposed the state's largest metropolitan area, Phoenix, which usually supports the Republican Party. Congressional redistricting in 2013, following the publication of the 2010 Census, divided the Tucson area into three Federal Congressional districts (the first, second and third of Arizona). The city center is in the 3rd District, represented by Raul Grijalva, a Democrat, since 2003, while the more affluent residential areas to the south and east are in the 2nd District, represented by Republican Martha McSally since 2015, and the exurbs north and west between Tucson and Phoenix in the 3rd District are represented by Democrat Ann Kirkpatrick since 2008. The United States Postal Service operates post offices in Tucson. The Tucson Main Post Office is located at 1501 South Cherrybell Stravenue.

Who represent's Tucson's wealthy areas in Congress?
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A:
Martha McSally