What was the cause of the Mandate System & Self-Determination

Explanation:

Mostly, the victors of World War I (including the UK, Japan, and France) split the colonial territories of the defeated German and Ottoman empires. It was not until the late 1950s and 1960s that most of the territories and countries under the Mandate System gained self-determination.

the answer is migration

c. the king has significantly abused the colonists' rights many times over a long period of time.