Question

Why did the victory of 1812 lead to the creation of the Monroe Doctrine?

Answer 1

A sense of nationalism emerged in the USA

Explanation:

The 1812 victory brought the creation of an authentic national sentiment in the USA. It was called the Second War of Independence. In 1814 Francis Scott Key wrote "the star-spangled banner" during the bombing of Washington by British forces. It became the national anthem in 1931.

The 1823 Monroe Doctrine is based on the idea that Americans claim to be utterly legitimate to intervene on the American continent and refuse any European interference.