Why did John quincy allow general jacksons invasion into spanish east florida?
He didn’t. Jackson led the US Army’s campaign in Florida during the First Seminole War, which lasted from either 1816-1818 or 1817-1818 (the year the war started is in dispute). John Quincy Adams was not elected president until 1824 and did not become president until March 4, 1825. President James Monroe ordered Jackson into Georgia to fight the Creek and the Seminole, he also ordered him to prevent Florida from becoming a haven for runaway slaves. Adams was Monroe’s Secretary of State and he defended Jackson’s actions in Florida, going so far as to tell a Spanish minister that Spain either send troops to Florida to defend the Spanish territory or give it to the US. It was Manifest Destiny, John Quincy Adams like so many others after him believed the US should not only expand across the continent to the Pacific but should incorporate the whole of the North American continent. So he saw absolutely nothing wrong with Jackson’s actions in Florida.