Their interdependency is not as clear as author insists. They rather both depend on how much recources a nation has to spend on wars and military preparations. US developed in a situation where they didn't have any serious military competition nearby - nothing like Europe (until lately), Russia, China, Middle East or Africa. If US would have to constantly fight for a couple of centuries with, let's say, Canada for territories and resources, the situation would be completely different now. Again, if US would get a serious threat right on their borders, the situation with freedoms and economical prosperity would change pretty soon. Just look at how things have changed after 9/11 - two big buildings destroyed by an enemy. Now imagine the same on the scale of the hole country, with millions of casualties and whole cities in ruins - that's the real war on your territory. Do you get the picture now?
Their interdependency is not as clear as author insists. They rather both depend on how much recources a nation has to spend on wars and military preparations. US developed in a situation where they didn't have any serious military competition nearby - nothing like Europe (until lately), Russia, China, Middle East or Africa. If US would have to constantly fight for a couple of centuries with, let's say, Canada for territories and resources, the situation would be completely different now. Again, if US would get a serious threat right on their borders, the situation with freedoms and economical prosperity would change pretty soon. Just look at how things have changed after 9/11 - two big buildings destroyed by an enemy. Now imagine the same on the scale of the hole country, with millions of casualties and whole cities in ruins - that's the real war on your territory. Do you get the picture now?
Computer Destruction Championship.
First prize: Brand new P4 PC