While Puerto Rico became a U.S. possession in 1899, migration to the United States increased dramatically
a. after World War II.
b. after World War I.
c. in the last ten years.
d. in the last twenty years.
Question 2
Two factors were said to account for the high rates of Puerto Rican family poverty. These two factors are
A) language problems and lack of employment.
B) employment patterns and female-headed households.
C) single parenthood and inadequate welfare benefits.
D) large family size and employment patterns.
Migration of naive and effector T lymphocytes
Annual Water Use in the United States
Black and White Out-Migration from Virginia and North and South Carolina, 1870–1940 (in thousands)
Prevalence and Sex Distribution of Top 10 Autoimmune Diseases Diagnosed in the United States
Total Fertility Rate in the United States, 1860–2008
GDP per Capita in the United States, 1870–2009 (Ratio Scale)