The correct statement that evaluates the cause of increased migration to the U.S. based on the population distribution shown in the table is:
There was overseas migration from Europe and Asia to U.S. port towns.
This statement accurately reflects historical patterns of increased immigration during the time period represented in the table, particularly during the late 19th and early 20th centuries when many immigrants arrived in port cities for employment opportunities as cities grew and industrialized. The other options do not accurately represent the context of migration trends as reflected in the urban and rural population percentages.