Thomas Edison championed direct current (DC) as the standard for electrical power distribution. He built DC power plants and argued for its safety and efficiency, especially for local applications like lighting.

Nikola Tesla invented the AC induction motor, which was more efficient than DC motors and could be used for a wider range of applications. This invention was a major breakthrough for AC technology.

George Westinghouse recognized the advantages of AC and licensed Tesla's patents. Westinghouse's company began to develop and promote AC power systems, setting the stage for a direct competition with Edison's DC systems.

Edison launched a public relations campaign to discredit AC, emphasizing its alleged dangers and using scare tactics to discourage its adoption. He even staged public executions of animals using AC to demonstrate its lethality.

Westinghouse won the contract to light the World's Columbian Exposition in Chicago using AC power. This was a major public demonstration of the capabilities and safety of AC, helping to sway public opinion in its favor.

Westinghouse secured the contract to build the power generation system at Niagara Falls using AC technology. This project proved the feasibility of long-distance AC power transmission and cemented AC's dominance in the electrical industry.

By the early 20th century, AC had become the dominant standard for electrical power generation and distribution worldwide. Its ability to be efficiently transmitted over long distances and its versatility for various applications made it the clear winner in the 'War of the Currents.'