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What was the main accomplishment of the Panama Canal? Greatly reduced travel time between the Atlantic and Pacific Oceans
The canal made the trip between the Atlantic and Pacific Oceans quicker.
then there would be a flood? No. The Canal has locks to raise ships to the level of Gatun Lake. This lake sit considerably higher than sea level where the ships begin transiting though the Panama Canal. Gatun Lake and it's connecting rivers are used as the main portion of the "canal" to transport ships (close to 30 miles). If you took the locks out, Gatun Lake would drain out. Aside from the environmental impact, that entire portion of the canal would need to be re-dug deeper so that ships can pass through the entire way at seal level.
three main problems workers had while building the panama canal were engineering, sanitation, and organization
Greatly reduced travel time between the Atlantic and Pacific Oceans
It can be said that the Panama Canal has benefited every country in Central America because the Panama Canal provides a way to go through North America and South America. If it wasn't there, you would have to go around South America to get past North or South America by boat.
The main US interest in Panama is the Panama Canal, which allows ships to travel between the Atlantic and the Pacific without having to go all the way to the tip of South America to do so.
The Colombian government had been blocking U.S. plans to build a canal in Panama. So Teddy Roosevelt supported Panamanian rebels to get what he wanted.
a continuued u.s presence would guarantee peace in the area
You can start by reading Teddy Roosevelt's autobiography, but be aware of his own personal biases. Any regular biography of Roosevelt should also contain commentary on the canal, since he was the main force in ensuring it's completion. type panama canal into Google...check out a few sights, the best of the results is panamabusinessandtravel.com
During the building of the Panama Canal, workers had to go through attacks of mosquitoes and malaria.
The main channels that cross the mountains of Panama are well above sea level. Ships are raised to reach them, then lowered back down at the other end. To dig a sea-level canal would have required the removal of an impossibly large amount of rock.