In 1903, the United States negotiated a treaty with Colombia that granted the United States the right to construct and operate a canal for 100 years within a zone six-miles wide across Panama.
The purpose for registering with the Selective Service upon turning 18 is because when in crisis men would be called upon to enter the military after doing a mental, physical, and moral fitness check. Registering for the Selective Service is a duty.
That would be called the trough
Among the factors that shaped modernism were the development of modern industrial societies and the rapid growth of cities, followed by the horror of World War I. Modernism was essentially based on a utopian vision of human life and society and a belief in progress, or moving forward.
It is the first answer because most immigrants of that time period were from northern Europe because it was very crowded. Specifically Ireland had a lot due to the potato famine (1845-1852).