To build the panama canal, the united states backed a revolution in
(a) colombia
(b) guatemala
(c) nicaragua
(d) costa rica
(e) honduras

The best answer is A.

In 1903, the United  States supported a rebel group from Panama which was then part of Colombia. 

The US signed a treaty with Colombia called the Hay - Herran treaty which granted the USA use of the canal on its completion.

The Colombian government refused to sign for fear of losing sovereignty  and the US responded by approving a rebellion by Panama nationalists which started on November 1903.

The US sent a battle ship to Panama  to " protect American lives" in Panama  making  Colombian forces  afraid to sail to Panama to quell the rebellion. The rebellion succeeded and Panama declared itself independent from Colombia.

The best answer is A.

Explanation:

In 1903, the United  States supported a rebel group from Panama which was then part of Colombia. 

The US signed a treaty with Colombia called the Hay - Herran treaty which granted the USA use of the canal on its completion.

The Colombian government refused to sign for fear of losing sovereignty  and the US responded by approving a rebellion by Panama nationalists which started on November 1903.

The US sent a battle ship to Panama  to " protect American lives" in Panama  making  Colombian forces  afraid to sail to Panama to quell the rebellion. The rebellion succeeded and Panama declared itself independent from Colombia.

gpd hope this

~blake