I've seen enough of the world to know how it works. And enough more to be sure.
Whoa!
Okay, analysis of that statement.
You've seen enough of the world to support your viewpoint.
So, if all you've "seen" of the world is what you read in textbooks, that's enough to support your viewpoint.
If all you've "seen" of the world is the town you live in, that's enough to support your viewpoint.
When all you know is Hometown, USA, all you know is Hometown, USA.
Of course your view is "correct".
A 3 month old's view that the world is centered around Momma's mammaries is also "correct".
Limited by it's age, experience, capabilities and intellect, but still "correct".
Now, try explaining balance of trade to said 3 month old.
No effect.
Show nipple.
Happy baby.
Try explaining to Marlowe that the US's oil-based foreign policy that supports oppressive totalitarian regimes is the primary reason for terrorist attacks against the US.
No effect.
Tell Marlowe that those bad people are jealous of our superiour culture.
Happy baby.
Travel broadens the mind.
If nothing else, it shows you that the people around the world are just like the people in Hometown, USA. Except they're coloured differently, speak a different language, have some strange habits and like funny food.