FWIW, the U.S. would be incredibly hard to invade. It does have a number of geographic advantages that no other country can match (not least of which is the Mississippi River system).
Even Pearl Harbor was a hit and run attack. No Japanese troops ever touched shore.
The Brits, Spaniards and French didn't invade, they established colonies. These colonies actively engaged in trade and defense agreements with various native American tribes. At various times different tribes were aligned with one European nation or another, with the most famous example being the French and Indian War, with the Iroquois and Cherokee allying with the British and the Wabanaki, Abenaki, Shawnee, etc allying with the French.
Native American tribes and nations had deep seated rivalries and disputes going back centuries (just as the Europeans did), so there never was any kind of single unified America until the U.S. expanded across the continent.
Notably the British did not succeed in the War of Independence or the War of 1812, despite having a superior military and navy.
Your first point, “America is a single market” is a fact, and a pretty uncontroversial one.
America being “geographically isolated from war” is conjecture. Whether Mexico will invade, or whether Pearl Harbor is part of your definition of “America” is irrelevant, it’s not a fact.
America “being able to produce everything” is not a fact and much too vague to ever be a fact. To begin with there are 20 mineral commodities that the US fully relies on imports to acquire. Could these be found in the US? We don’t know, and this is only one example, regardless it’s not a fact.
Americans being “ambitious to a fault” is not a fact, it’s your opinion and generalization based on the americans and non-americans you have met and interacted with.
A fact means something, it doesn’t mean “like an opinion but a really strongly held opinion”.