6) This dynasty unified China in 221 BCE, standardized the language, and built the Great Wall before being overthrown in 206 BCE.

Qin Dynasty

Explanation:

Qin shihuangdi was the only ruler to unify all of china, and standardized weights and measurements.

d) a week

because the land run of 1889, although not without precedent in the history of the west, further, their men were aboard the first trains, ready to jump off and begin staking their claims. oklahoma city, edmond, and guthrie were all so affected.