French involvement in the American Revolutionary War of 1775–1783 began in 1775, when France, a hotbed of various radical Enlightenment ideas and long-term historical rival of the Kingdom of Great Britain, secretly shipped supplies to the Continental Army when it was established in June 1775.
<span>John D. Rockefeller did everything by his own. Vertical integrations means that he employed his own workers, then he constructed barrels to store oil and rent wagons and horses to transport that barrels. So it's called vertical integration. </span>
In the late 1800s, American cities suffered from serious environmental pollution due to the smokestack emissions from hydroelectric power plants. The correct answer is D.
