In 1917 when the U.S. entered the war the central powers realized they were too weak because they were running out of men. Also they were in econoic trouble so they couldn't afford to keep fighting. So they came to the agreement of The Treaty of Versailles.
Answer:
I think d I could be wrong tho
Maybe they had good harbors and good trading goods
It would be the "joint occupation" policy that allowed people from both Britain and the United States to settle in Oregon country, since this was thought to be the most economically advantageous for the region.