(A) It helped the U.S. to spread democracy
(B) ** It improved trade relationships
(C) It allowed for more immigration
(D) It protected the U.S.
EXPLANATIONS BELOW
Concept note-1: -Americans knew they needed this to move ships from east to west quickly. If they did that, they would control power because they would control the oceans. The Canal was a geopolitical strategy to make the United States the most powerful nation on earth. Also, the economic impact was massive.