What different factors attributed to the adoption of the manifest destiny policy

For the answer to the question above, t The philosophical support for manifest destiny was based on the idea that America was destined to expand democratic institutions in North America, which gave the nation a superior moral right to govern areas where other interests would not respect this goal. This was particularly clear with respect to Texas, and the alternative of a Mexican dictatorship, but it was also applied to the Oregon territory. Britain itself might be democratic, but that was not its purpose in Oregon.

Manifest destiny was a popular and easily understood phrase, which was adopted by successive political parties. Originally the position of the Democratic Party, it was absorbed into the platforms of the Whig and later Republican parties. Even the Alaska Purchase of 1867 and acquisitions outside the continent, such as Guam and Hawaii, were promoted as examples of manifest destiny in action. Gradually, the phrase became seen as a cover for imperialism and political support has died out.