The Qin dynasty was the first dynasty to start connecting the various walls into a greater whole. That happened around 221 to 206 BC and was done under the reign of Qin Shi Huang. Though the wall was later improved still by other dynasties, it was during the Qin dynasty that the Great Wall of China was first formed into a cohesive structure.
It made it harder for immigrants to become citizens and made it so the president could imprison non citizens.
Because you need to win the electoral college, instead of the popular vote, a candidate usually tries to campaign in states with lot of electoral votes, and usually refrains from going to smaller states.
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I think they have had 66 with an average of one every 1.14 years
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B easily because it has more information
B is the only one with a plural pronunciation