What was the main reason that trade, or rather industry, thrived during the growth of
capitalism?

The answer is free enterprise, or the free market, refers to an economy where the market determines prices, products, and services rather than the government. Businesses and services are free of government control. Alternatively, free enterprise could refer to an ideological or legal system whereby commercial activities are primarily regulated through private measures.

Explanation:

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.