After the death of his first wife and his mother, both on the same day in 1884, the grieving Roosevelt moved to the Dakota Territory, where he lived as a rancher for the next two years. Upon returning to New York, he remarried and had six children, including one from his first marriage. After an unsuccessful run for the mayorship of New York, he became president of the New York City Board of Police Commissioners and later served as the Assistant Secretary of the U.S. Navy. Roosevelt resigned from his post upon the outbreak of the Spanish American War in 1898 and started his own volunteer regiment. The regiment defeated the Spanish forces in the Battle of San Juan Hill and Roosevelt returned home a hero.
His image as a war hero gained him popularity and he was soon elected governor of New York. Roosevelt became William McKinley's running mate in the 1900 election and the duo won in a landslide over the Democrats. However, McKinley was assassinated in September 1901, and Vice President Roosevelt became president.
Roosevelt shared the Progressive vision of a powerful and efficient government that could confront both corruption and the growing power of corporate interests. Given his notoriety and strong personality, Roosevelt became the face of the Progressive Party. In fact, the party soon became known as the Bull Moose Party after Roosevelt told a reporter that he felt as fit as a bull moose even after almost he was almost killed by an assassin. Roosevelt could have regained presidency following President Wilson's second term, but his health rapidly declined towards the end of World War I, leading to his death in 1919.
Although the original home where young Roosevelt lived was demolished in 1916, an organization formed after his death rebuilt the home and opened it as a museum dedicated to the 26th President.