Which of these was an effect of the rapid industrialization of the united states in the last half of the 19th century?

The answer is The economy was increasingly controlled by big corporations.
Rapid industrialization in united states made big company able to produce an abundant amount of products with cheaper price.
This make the consumers are heavily dependent on their products and the majority of people's earning will always flow back to the big corporation.

The correct answer is b

It was a combination of conquests and alliances