Spanish-American War: The Spanish-American War was a conflict between the United States and Spain in 1898 that resulted in America's acquisition of territories such as Puerto Rico, Guam, and the Philippines.
Open Door Policy: The Open Door Policy was a diplomatic approach promoted by Secretary of State John Hay that advocated for equal trading rights with China among various foreign powers.
Gold Standard Act: The Gold Standard Act passed during McKinley's presidency established gold as the only standard for redeeming paper money, which had implications for currency stability and international trade.