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You're taking a lot of liberty with the term war here :) And in none of your examples was trade even remotely as great a consideration as were strategic region

You're taking a lot of liberty with the term war here :) And in none of your examples was trade even remotely as great a consideration as were strategic regional rivalries between global powers, e.g., Germany in pre-WWII mexico and carribean, the Soviets for the rest of the century... The United States' entry into WWI had nothing to do with forcing Germany to trade. Literally nothing. I'll let you refresh your own memory regarding events at that time, including Germany's unrestricted submarine attacks on American civilians.

beatgammit 8y ago
To be fair, the US was smuggling guns and other aid to Germany's enemies, so it makes sense for them to put an end to that. The US was already involved in the war, they just didn't have the full military on the ground, which needed a declaration of war, which the attacks on the transport ships allowed. But I definitely agree that it has pretty much nothing to do with the OP's point.