It could acts as evidence to support the author’s arguments because:
It demonstrate that migrants were said to be attracted to a lot of areas of the cultural, political, and economic systems that imperial powers is known to have brought to their colonies.
The term "Migrant" connote a person that is said to have moves away from his or her place of normal or first place of residence, that exist within a country or others and move to somewhere else based on some issues.
Migrants were said to be attracted to a lot of aspects of the cultural, political, and economic systems that imperial powers had given to their colonies and as such they migrated to great Britain.
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