Foreign Policices By diamondc Jan 1, 1862 French Invasion of Mexico French invasion of mexico in 1862; Foreign policies were used were isolationism, and Monroe Doctrine. Period: Jan 1, 1862 to Jan 1, 2003 Foregin Poilicy Jan 1, 1898 Spanish American War begins isloationsim, and Monroe Doctrine Jan 1, 1899 Trade wars in China open door policy Jan 1, 1902 Panama Canal authoized roosevelt corollary,good neighbor policy, monroe doctrine