Theodore Roosevelt Theodore Roosevelt swept into the White House (which he so named) under rather unfortunate circumstances; he had been vice-president under William McKinley, who was assassinated in September 1901. “Theodore Roosevelt” made exceedingly fortunate use of his time. The youngest President ever inaugurated; Roosevelt was also among the most energetic chief executives ever. “The first [President] since Andrew Jackson to remind people that our government was a flexible insTheodore Rooseveltument” (Andrews ix), Theodore Roosevelt boldly and decisively acted where others had waited for Congress to d