The near west side (and the near east side, which also has a fair number of Hispanics) were run-down, dangerous neighborhoods. The Hispanics have fixed up the property and are improving the areas. The groceries serve the immigrant workers like those who work with my son, who are LEGAL and go home for two-three months each winter.
The policy of the city is to welcome LEGAL immigrants, and I can assure you that someone running a grocery store is a legal immigrant.