Answer:
Manifest destiny
Explanation:
Manifest Destiny represents the belief used to justify the westward expansion of America's borders in the 1800s. Manifest Destiny helped create a western settlement and war with Mexico
The oil fields would enable Germany to fuel their air forces, making them harder to defeat.
It would be mostly "idealism" that was <span>more important in driving American foreign policy in the years 1895 to 1920, since this was a time when the US had largely finished expansion and instead was focused on liberation--as was the case in Cuba. </span>
Constantinople (now Istanbul), establishing the Eastern Roman Empire, which would survive for more than a thousand years.