Yes.
Essentially, it overthrew itself. The nation gradually weakened, and eventually was being controlled by powerfull nobles. The nobles rebelled and declared themselves kings, and and the dynasty ended in 256 BC. Qin Shi Huang reunited china in 221, after the warring states period. Eventually, the Qin Dynasty was created.
Yes.
Democracies
tyrants
Yes
Yes.
The Greeks established colonies for trading with other city-states.
By marrying rich merchants.
By marrying rich merchants.
what ideas developed in Greeks city-states
The city-states of Sparta and Athens were constantly feuding, and this occasionally led to war.
Polis