"Remember the Maine!" What started as a toast to remember the 260 men who died due to the explosion that took place on the USS Maine in Havana Harbor on February 15, 1898. This phrase combined with over-the-top reporting of the incident led to the beginning of the Spanish-American War. While the war only lasted six months, its importance in terms of American imperialism and future military actions was huge. Want to know about the war that started with the cry 'Remember the Maine!' and helped make Theodore Roosevelt a war hero? Here are seven essentials that you should know about the Spanish-American War.