Answer:
Wealth among European working classes
Explanation:
Wealth among European working classes "grew during the New Imperialism."
This is because the New Imperialism is characterized by the many European nations colonizing the smaller territories such that they brought some of their working-class personnel to the colonized nations to work and earn more money, thereby getting more wealth.
They also took some of the colonized natural resources to their nation at cheaper rates, thereby enriching their nations and its economy.
