Who are some of the important people during US Imperialism?

During U.S. Imperialism, key figures included President Theodore Roosevelt, who championed the expansion of American influence abroad through his "Big Stick" diplomacy. Admiral Alfred Thayer Mahan emphasized the importance of naval power, influencing naval strategy and expansion. Additionally, figures like Secretary of State John Hay were crucial in negotiating treaties such as the Open Door Policy in China, while figures like William McKinley oversaw the annexation of territories like Hawaii and the Philippines.