You are proposing isolationism. The only thing you're not giving up is trade, which in no way means it's not isolationism. Trade is a necessity for any country's economy. If we didn't trade with other countries, we wouldn't be able to supply ourselves with everything we need. Your proposal promotes little more than apathy and indifference to the outside world. Let me ask you a question: if you saw a guy getting mugged in the street, and you were perfectly able to help him, would you help him, or just walk off like nothing happened? For a country such as ours, isolationism simply will not work.