The main thing that the AEF, doughboys, and harlem hellfighters (369th regiment), have all in common is that they were part of the "American Expeditionary Forces," who were sent to Europe in 1917.
The answer is D. The relationship of Americans with their European or African groups
The answer is <span>The canal would remove trade barriers between the United States and South America. because they would need to move around all of south america </span>
