Final answer:
Districts in a state are named based on population data from the United States Census. The process of redrawing these districts is required to maintain balanced representation and to avoid malapportionment.
Step-by-step explanation:
Districts within a state are named and drawn based on population, as determined by the United States Census conducted every ten years. This ensures that more populous states have more representation in the House of Representatives. However, it is not true that states can gain but never lose districts; the number of districts can change depending on population shifts. Some states may be known to use redistricting to benefit partisan groups, which is often referred to as gerrymandering. It is constitutionally mandated that district boundaries are regularly redrawn after each decennial Census to maintain nearly equal population in each district and prevent malapportionment, which refers to over or underrepresentation in districts.