Final answer:
In 1901, President Theodore Roosevelt made "White House" the official name of the president's house.
Step-by-step explanation:
In 1901, President Theodore Roosevelt made "White House" the official name of the president's house. The White House, located in Washington D.C., has served as the residence and workplace of the President of the United States since John Adams in 1800.
Prior to 1901, it was often referred to as the "President's House" or the "Executive Mansion." Roosevelt's decision to officially name it the "White House" has since become the widely accepted and recognized name for the president's residence.
This change in name reflects the importance and significance of the White House as a symbol of the presidency and the United States government.