The War of 1812 and the conflict over the Oregon territory would affect international relations with the British. The Mexican-American War, over the annexation of Texas, would lead the conflict with Mexico. Manifest Destiny did not just effect the relationships the American people would have with those located within their border, or the borders of the continent they wished to control. Prior to the Civil War these would be the two major instances of the effect Manifest Destiny would have on international relations, but we have seen the effects as recent as the early 21st century. In the late 19th century the United States would begin to expand outside the borders of the mainland North American continent and claim such places as Hawaii and other Pacific Islands. President McKinley called it Manifest Destiny but others through history have called it imperialism . This venture into the Pacific Islands would ultimately cause issues in relations with the Spanish when the United States felt the need to interfere with the Cuban insurrection. The result of this would be that the United States gained more territories from the Spanish, Cuba, Guam, and the Philippines to be exact. Then it is brought to what has been seen in the manner the