Lusitania
Donor
So basically an American colony in all but name? Even the police force would likely have to be provided by the Americans, given how broke and ineffective early 20th century Morocco was.
It's innovative. It would be 21st century economic imperialism wrapped up in a late 19th century/20th century package.
Given that you would have American naval bases in Western Sahara, you can easily have the men stationed there double as reinforcements for a meager Moroccan occupation force.
I am still waiting for someone to demonstrate how the US could accomplish this. There is ASB possibility. Maybe they wave a wand.