The U.S wanted to build an canal because they wanted a secret passage way to a certain destination.
For better trade
Hi i am BOB
To bring stuff from one country to antother
Colombia failed to ratify the treaty and did not want to allow the USA build a canal on the isthmus of Panama.
Prior to railways, building canals was the most cost effective way to create a transportation infrastructure for moving bulk goods.
A crown build up is done when a person's tooth needs a crown. Usually cause my a large filling breaking or a tooth is broken. Once a tooth is more filling then natural tooth they usually want to put a crown on it. The tooth needs to have a solid foundation in order to support a crown, therefore they have to use special material in order to build the tooth up and prepare it for a crown. Also after any root canal, the dentist will want to put a build up in as teeth become very week after a root canal.. This ensure that the tooth is strong enough to support a crown.. Hope this helps
I don't know look it up your self
So that the trade route by boat was quicker than going all the way around South America to get to the other side of America to ship goods.
The United States sought to build a canal across Latin America primarily to enhance trade and military mobility between the Atlantic and Pacific Oceans. A canal, particularly in Panama, would significantly reduce travel time for ships, facilitating faster transportation of goods and naval forces. Additionally, it aimed to solidify U.S. influence in the region, promoting economic interests and asserting strategic dominance in global maritime affairs. The construction of the Panama Canal was ultimately realized in the early 20th century, reflecting these objectives.
If you want aids
It was Theodore Roosevelt
Im not sure of the question but sounds like the doctor already removed the inerts of the tooth and placed a filling into the root. That is what a root canal therapy is. If you want to remove the root canal filling material and replace it with a more biocompatible material there are dentist that do that.