replacing the dollar is a terrible idea ... and recall that even replacing the paper dollar with a coin has failed more than once. i think there is more support for replacing other countries' currencies with the dollar. not so much canada or mexico, but some of the latin american countries. many have already done so, in fact, as their respective currencies were too unstable.
as for the new highway, or any other new trade corridor, we probably need to examine our trade policies. but i'm not sure you can really stop this type of thing from happening unless china & mexico improve their working conditions ( + business costs) or we start passing strict protectionist laws (which don't really work in my view).
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