2. Why did Wakanda go into isolation?

Wakanda is home to a lot of Vibranium, one of the strongest metals in the Marvel Universe. To keep it out of the wrong hands, the ancestors isolated themselves. This idea is reinforced in Black Panther's mind when Ulysses Klaw breaks into Wakanda, kills his people, and steals Vibranium to sell to arms dealers.

Explanation:

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Wakanda is home to a lot of Vibranium, one of the strongest metals in the Marvel Universe. To keep it out of the wrong hands, the ancestors isolated themselves. ... If it's advanced technology were to be put into the wrong hands, like the ancestors were worried about, it would be devastating

julius caesar turned the roman republic into the roman empire by coming in and taking the "dictator" role during the time of a civil war (elites vs lower classes) winning battles and reputation, then declaring him dictator for life

hope this : )