The correct answer is the last option: "The State population increased", the United States House of Representatives has a total of 437 seats that are divided according to the population of each State. For example, California's population is 39.54 million which means it has 53 representatives, but Hawaii's population is 1.43 million so it only has 2 representatives. If, hypothetically, everyone left California and moved to Hawaii and vice versa, then Hawaii would have 53 representatives and California would have 2.