Final answer:
The three primary levels in the union structure are the federal level, state level, and local level. Each level has different roles in the government.
Step-by-step explanation:
The three primary levels in the union structure discussed in the text are the federal level, state level, and local level. Each level fulfills different roles in the government. The federal level is responsible for making laws and policies that apply to the entire country, such as national defense and foreign affairs. The state level has the power to create and enforce laws within their own state, such as education and transportation. The local level, which includes cities and counties, handles matters that directly affect the local community, such as public safety and zoning regulations.