Overall, does illegal immigration have a positive or a negative impact on the u. s. economy? what is the best thesis statement for this research question? a. reports by the u. s. department of agriculture show that certain segments of the u. s. economy are entirely dependent on a workforce of undocumented immigrants. b. though there are many ways to analyze the economic impact of illegal immigration, most analyses show that taxes generated by immigrants outweigh the costs of the services they use. c. estimating the total economic impact of illegal immigration requires analyzing multiple factors. d. the economic impact of illegal immigration has risen steadily over the past few decades.