You will be given a definition of a task first, then some input of the task.
You are given a passage. You need to construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is the whole paragraph. Avoid creating questions that can be answered correctly without actually understanding the paragraph.

Practical: As there are multiple very-incompatible voltages in use (110v, 220v), it's a good idea to not have the same plugs. Somebody will inevitably plug in the wrong device, and putting a 110v device on 220v can be pretty nasty. Dual voltage devices which are popular today (largely due to power semiconductors which make them inexpensive), didn't exist when plugs were designed!

Political: Many ex-colonies of Britain were trying to shake off British influence as far as possible, which probably was a factor in picking different system for power device standards, among others.
Output:
How is it that different countries have come up with different styles of electrical socket pins?