The correct statement evaluating 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 option aligns with historical trends during the time period represented in the table, where significant waves of immigrants from Europe and Asia migrated to the U.S. in search of better economic opportunities, particularly in urban areas, leading to the increased urbanization reflected in the percentages.