Although you have not provided the graph, there are historical reports that confirm that after 1965 the numbers of immigration from Europe to the USA leveled off.
Explanation:
Immigration numbers from Europe to the US leveled off from 1965, with the creation of the Immigration and Nationality Act, which removed a racist and discriminatory concept that limited the number of immigrants from southern and eastern Europe, Asia and other groups ethnic groups that were not part of Northern Europe.
Although many expected that this would increase the number of European immigrants in the country, the result was to level European immigration in the country and what really happened was an increase in immigration from countries in Africa and Asia and a certain, albeit limited, increase in immigrants From Latin America.
The company management strategy that was used to suppress the Homestead Strike was cutting the wage earnings of roughly 300 some employees. Carnegie Steel was the company that came up with this plan.
The best option from the list would be "confederate," since this type of government creates a "loose" bond between states with a relatively "weak" central government.
