William McKinley (January 29, 1843 -- September 14, 1901) was the 25th President of the United States, serving from March 4, 1897 until his assassination in September 1901, six months into his second term. McKinley led the nation to victory in the Spanish -- American War, raised protective tariffs to promote American industry, and maintained the nation on the gold standard in a rejection of free silver (effectively, expansionary monetary policy).

Answer this question based on the passage: who was the president of the united states in 1900? Okie... think carefully first, then make a decision:
To answer the above question, the relevant sentence is: William McKinley (January 29, 1843 -- September 14, 1901) was the 25th President of the United States, serving from March 4, 1897 until his assassination in September 1901, six months into his second term. So, the answer is William McKinley.