Final answer:
Census data affects the allocation of seats in the House of Representatives by determining the number of seats allotted to each state based on population. District lines are redrawn to maintain equal representation, and gerrymandering can influence this process.
Step-by-step explanation:
The population data gathered in a census has a significant impact on the allocation of seats in the House of Representatives. Every ten years, following the national Census, the number of House seats allotted to each state is determined based on population. More populous states have more representation, as they are allocated a greater number of seats in the House. District lines are redrawn to ensure each district has an equal number of citizens after any changes in the number of seats. This process can be influenced by gerrymandering, which is the manipulation of district lines to favor a desired electoral outcome.