Problem: Switzerland:

In about 260 AD, the fall of the Agri Decumates territory north of the Rhine transformed today's Switzerland into a frontier land of the Empire. Repeated raids by the Alamanni tribes provoked the ruin of the Roman towns and economy, forcing the population to find shelter near Roman fortresses, like the Castrum Rauracense near Augusta Raurica. The Empire built another line of defense at the north border (the so-called Donau-Iller-Rhine-Limes), but at the end of the fourth century the increased Germanic pressure forced the Romans to abandon the linear defence concept, and the Swiss plateau was finally open to the settlement of German tribes.

What was the name of the concept used by the Roman Empire when building another line of defense at the north border?
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A: the linear defence concept

Problem: Florida:

Florida i/flrd/ (Spanish for "flowery land") is a state located in the southeastern region of the United States. The state is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia, to the east by the Atlantic Ocean, and to the south by the Straits of Florida and the sovereign state of Cuba. Florida is the 22nd most extensive, the 3rd most populous, and the 8th most densely populated of the United States. Jacksonville is the most populous city in Florida, and the largest city by area in the contiguous United States. The Miami metropolitan area is the eighth-largest metropolitan area in the United States. Tallahassee is the state capital.

What states border Florida
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A: to the west by the Gulf of Mexico, to the north by Alabama and Georgia, to the east by the Atlantic Ocean, and to the south by the Straits of Florida

Problem: The Blitz:

Within the Luftwaffe, there was a more muted view of strategic bombing. The OKL did not oppose the strategic bombardment of enemy industries and or cities, and believed it could greatly affect the balance of power on the battlefield in Germany's favour by disrupting production and damaging civilian morale, but they did not believe that air power alone could be decisive. Contrary to popular belief, the Luftwaffe did not have a systematic policy of what became known as "terror bombing". Evidence suggests that the Luftwaffe did not adopt an official bombing policy in which civilians became the primary target until 1942.

What year did the terror bombing policy become official?
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A: 1942

Problem: Yale University:

In 1718, at the behest of either Rector Samuel Andrew or the colony's Governor Gurdon Saltonstall, Cotton Mather contacted a successful businessman named Elihu Yale, who lived in Wales but had been born in Boston and whose father, David, had been one of the original settlers in New Haven, to ask him for financial help in constructing a new building for the college. Through the persuasion of Jeremiah Dummer, Yale, who had made a fortune through trade while living in Madras as a representative of the East India Company, donated nine bales of goods, which were sold for more than 560, a substantial sum at the time. Cotton Mather suggested that the school change its name to Yale College. Meanwhile, a Harvard graduate working in England convinced some 180 prominent intellectuals that they should donate books to Yale. The 1714 shipment of 500 books represented the best of modern English literature, science, philosophy and theology. It had a profound effect on intellectuals at Yale. Undergraduate Jonathan Edwards discovered John Locke's works and developed his original theology known as the "new divinity." In 1722 the Rector and six of his friends, who had a study group to discuss the new ideas, announced that they had given up Calvinism, become Arminians, and joined the Church of England. They were ordained in England and returned to the colonies as missionaries for the Anglican faith. Thomas Clapp became president in 1745, and struggled to return the college to Calvinist orthodoxy; but he did not close the library. Other students found Deist books in the library.

Where did Elihu Yale die?
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A:
unanswerable