The Americans involved contributed to the success of the canal project. That the discovery that mosquitoes carried disease, a discovery that occurred after the French left and before the Americans took over played a huge role. The Americans implemented measures to combat the mosquitoes. Whether any other country would have spent the resources the Americans did on that piece of the puzzle can't be known. Americans also financed and designed the railroad prior to the French involvement.
None of the above excuses Trump's jingoistic bullshit but Americans should get credit for their contributions just as the Afro-Caribbean workers should also be recognized for their contributions. Trump's blathering should be an embarrassment to all Americans.
It wasn't on US land and Americans didn't carry out the actual physical labour (same goes for the French). Whether some credit is due for technical know-how, I don't think anyone ever says you take ownership of something simply by providing that sort of expertise.
Rather than instigating a new era of Imperialism, a project that would be useful is if there was some way of co-operating with Nicaragua to build a second canal, along the route that has been proposed in the past. Surely the constructive way to drive down costs is via competition?
