Answer: Athens and Sparta
Explanation:
-<span>world's longest human made structure at more than four thousand miles actually
</span>-co<span>nstructed from a series of smaller walls that were connected together built
</span><span><span>
-to guard against Mongol invaders</span></span>
Answer: they arrived over a land bridge
Explanation:they follow there food which means there nomadic. so they followed there food to north america
Knowing absolutely nothing about any of these events- obviously, "C". Is the only event necessarily capable of unifying a country.
<span>Nothing can possibly unite a country like overthrowing and kicking out foreign rulers! </span>
<span>A- No appointed ruler can satisfy all factions. </span>
<span>B- As above, so below. </span>
<span>D- Beside the fact that one guy arming himself is not going to make everybody happy, that he had to do it secretly implies that he must not have had all the country behind him. </span>
