Should the U. S get involved with the rest of the world or just stick to concierne within our borders?

We should, but not the way that pass administrations used to do.

Explanation:

Foreign relations are important. Completely secluding ourselves from other country will make it harder for companies In United States to establish business relationships with people in other country and we would be left without an alliance if other countries decided to declared war against us in the future.

Pass administrations (George W. Bush's for example) abuse United States foreign influence by meddling In  other country's private businesses. (Such as the disaster that we had with Middle East.)

That's not the foreign policy that we should be involved in.

We could focus on other more productive involvement such as working together with developed nations to solve global warming problems, establishing a fair business relationships with other countries that possess unique goods/products that we don't have, creating military alliance with the countries that possess a same ideology, etc.

you should think about the answers you give and expect the same form your questions.