Final answer:
The position that deportation was necessary because economic decline had increased the competition for jobs is most accurate, reflecting historical patterns where immigrants were often blamed for economic hardships.
Step-by-step explanation:
The cartoon presumably advocating for deportation is likely a reflection of sentiments at the time regarding immigration and national security. Given the historical context provided, the cartoons and policies like the Chinese Exclusion Act and deportation of Mexican Americans, were more deeply rooted in xenophobia and economic self-interest rather than a measured response to actual societal issues like unsuccessful assimilation programs or the infiltration of communists. Hostility towards immigrants was often used by politicians to gain support by scapegoating immigrants for economic and social issues.
Answering the question, the position that deportation was necessary because economic decline had increased the competition for jobs would be most accurate. This reflects the historical pattern where immigrants were frequently blamed for taking jobs and undercutting wages, which intensified during times of economic hardship.