I would say id depends if you care about people any color, or size.
Rome managed to overcome it's difficulties with having issues in it's leading structure and the highest chain in command; namely Roman generals at the time wanted glory for themselves which prevented them from beating Carthage for some period together with the fact that Carthage had the incredible general Hannibal. After they consolidated and joined forces together, they were able to beat Carthage after a campaign of war.
British Anti-slavery. In the space of just 46 years, the British government outlawed the slave trade that Britain had created and went on to abolish the practice of slavery throughout the colonies. John Oldfield shows how this national campaign became one of the most successful reform movements of the 19th century.Feb 17, 2011
I think T'ai-tsu is the person who made Changan his dynasty's capital
