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Mesopotmia ;was about independence while Egypt was more about unifing
Ideology
There isn't a dynasty that are the strongest dynasty of China. Some times the dynasty is stronger, sometimes the dynasty s weaker, so it depends on the time you're talking about. For example, when the Shi Huang Di just unifing China, the Qin dynasty was very strong, but when his son ruled China, the Qin dynasty became really weak.
Ieyasu defeated his rivals at the battle of Sekigahara in 1600. The victory earned him the loyalty of daimyo throughout Japan. He later became the sole shogun and moved the capital, unifing Japan.