Is it possible that some historians might choose different causes as the most significant ones?

Of course.

Explanation:

Most of our history is based on modern studies, and some historians may not believe for many reasons. One, being because some historians are Christians, meaning to them, the Earth has been around for 6,000-10,000 years, but in history, the Earth has supposedly been around for 4.543 years.

ernest bai koroma (president) loko christianity

ahmad tejan kabbah (president) mandingo islam

johnny paul koroma (military junta limba christianity

julius maada bio (military junta mende christianity

for the 2 countries u can do china and america because america has a democratic government while china has a communist government.

a democracy is a government run by the people either by directly voting or indirectly by electing representatives. an oligarchy is a government run by a few or a small group of people. a democracy and oligarchy are similar because both in an oligarchy and an indirect democracy, a small group of induvial determine the laws for a large group of people they are different because in an oligarchy it is easier to control and they do not have to answer to a large number of people in the country, unlike a democracy where they do have to answer to a large number of people an county that is a democracy would be the united states. a country that is an oligarchy would be the china.