Was U. S expansion into Florida justifiable?

Clearly, the expansion of the U.S. is justifiable.

Explanation:

This made the Purchase of the Louisiana Territory completely justifiable, as well as the treaty over Oregon and Florida. ... This would make the war and treaty with Mexico for Texas and California in the 1800's justifiable.

doesn't make any since

explanation:

(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity