Europeans around the 1500 to 1600 hundreds
The US before this point had an interest to stay neutral. However, in 1917, Jan 16, the US was informed by the British Empire US to join the war since Germany would help Mexico regain land lost, the US saw that as a problem. This incited them to declare war (This event was known as the Zimmerman Telegram)
So in summary, yes, it was in the national interest of the United States to declare war in 1917
To incourage soldiers to keep on fighting
The economies of Chile and Venezuela differ based on the fact that they have different trades. For Chile it is considered to be the leader in the export destination and has defeated Venezuela. There are major products that serve as exports and they include petrol, coal and chemical products. The similarity between the two countries is in the fact that they are main exports of Colombia