Why does each state have two senators?

Why this is the answer

Each state has two senators so that small states have the same voice in the Senate as large ones. USCIS accepts two ways of saying this: equal representation, with "for small states" as an optional addition, or the name of the deal that created the arrangement, the Great Compromise, which the official list also calls the Connecticut Compromise. The deal settled one of the hardest arguments at the Constitutional Convention. Some delegates wanted every state's seats in Congress to depend on its population, which would favor the big states. Others wanted each state to count the same, no matter how many people lived there. The Founders could not agree, and the way out was a Congress of two parts: the House, where seats follow population, and the Senate, where every state gets two. Federalist No. 62 defended the result openly as a compromise between the large and the small states. It went further, arguing that an equal vote for each state recognizes the share of sovereignty the states kept, and helps them hold on to it. The essay also pointed to a practical effect: no law can pass without the agreement of a majority of the people, through the House, and of a majority of the states, through the Senate. The bargain was then locked in. Article V of the Constitution says no state can be deprived of its equal vote in the Senate without its consent. In the interview, either answer works on its own; you do not need to give both. Applicants sometimes describe the idea in their own words, for example "so every state is equal." The list's wording is the safer choice, since USCIS encourages applicants to answer with it. The real mistake is explaining the number instead of the reason, as in "because the Constitution says two," which restates the fact without giving the reason for it.