Answer:
Primary sources, because they can be more accurate about a certain incident or event.
Explanation:
The united states entered the war because Germany was using submarines to sink our trading ships, they also sunk a passenger ship called the Lustitania, which killed many civilians. Another reason they entered war was because Germany sent the Zimmerman telegram that they sent to Mexico to try to have them enter the war against us. The telegram said that if they helped Germany, Germany would help them get land back that they lost during the <span>Mexican–American War</span>.
The six essential elements, which are: The World in Spatial Terms, Places and Regions, Physical Systems, Human Systems, Environment and Society, and The Uses of Geography, contribute to the study of history because they are based on the geography standards that are individually a big idea that links several standards together.
Soviet Union is the country they were apart of.
