sentences:  Napoleon's bellicose stance towards Russia in the 1863 January Uprising divided the powers and greatly diminished any chance of a joint European intervention.The United States refused to recognize Maximilian's government and threatened to drive France out of the country by force, but did not become directly involved in the conflict even as Mexican resistance to Maximilian's rule grew.With the end of the American Civil War in 1865, the U.S. increased pressure on France to withdraw from Mexico, and the French presence in the Western hemisphere would be a major foreign policy issue for Lincoln's successor.