#美国中期选举进入最后冲刺 U.S. Midterm Elections: A Global Game of Power

A Midterm Exam That Determines Whether the President’s Next Two Years Will Be “Easy or Hard”
To understand this election, you only need to remember four words: midterm exam. The U.S. president serves a 4-year term, and “midterm elections,” as the name suggests, are nationwide elections held halfway through that term (in the second year). In this election, voters will choose all 435 members of the House of Representatives, about one-third of the Senate, and some state governors.
Although it’s a “midterm exam,” the stakes are extremely high. It directly determines which party controls Congress, and therefore whether the president can smoothly push policies through over the next two years or will be obstructed at every turn and become a “lame duck” early. So why does the U.S. have to hold such a complicated election? What exactly are the two chambers of Congress fighting over? To answer that, you need to understand the underlying design of American politics.

Which Chamber of Congress Controls the Money and the Appointments?
In international news, you’ll always hear about the “Senate” and the “House of Representatives.” When the U.S. was founded, large and small states argued fiercely over how many seats they would get. In the end, they compromised on a “bicameral system”: the House is elected in proportion to population, favoring large states; the Senate gives every state 2 seats, regardless of its size, favoring small states. So what do they actually do day to day? How are their powers divided?
Put simply, their roles are clearly defined:
1. The House of Representatives (controls the purse strings): All bills related to taxes and government spending (such as budget approvals) must originate in the House. Whoever controls the House holds the government’s purse strings.
2. The Senate (controls appointments and foreign affairs): The president’s appointments of cabinet secretaries and Supreme Court justices, as well as treaties with foreign countries, must be approved by the Senate. This is the underlying logic of American politics: checks and balances.
So what happens if the party Trump belongs to loses control of even one chamber in this election?

What Problems Would Trump Face If Congress Changed Hands?
Based on the current election outlook, a change in control of Congress would have an immediate impact on the Trump administration. First, domestic policies could be “deadlocked.” Trump’s proposed tax cuts and hardline immigration policies require legislation and funding from Congress. If the opposition takes control of the House, these bills may not even get a chance to be voted on.
Second, the administration could face an endless “storm of investigations.” The House has a powerful tool: investigative authority. If the opposition wins the House, it will likely immediately launch investigations into White House policies and even subpoena officials to testify. This would trap the government in an endless defensive battle and consume enormous amounts of energy.
Finally, budget battles could roil markets. If the two parties can’t agree on a government budget, the U.S. government faces the risk of a shutdown. For global investors, this uncertainty could directly trigger sharp volatility in financial markets.

The U.S. system of checks and balances between the House and Senate means its policies can never proceed smoothly. The president has their own agenda, while Congress imposes its own constraints. With power held in check on all sides, policies naturally tend to shift and reverse. Those shifts ultimately spill over into the global economy, trade tariffs, and market sentiment.
We don’t need to predict the outcome; we only need to understand the logic. Once you understand the checks and balances between the two chambers, you’ll understand the underlying reasons behind many international news stories. The next time you see a policy reversal, market volatility, or a government shutdown, you’ll no longer just be a bystander watching the drama—you’ll be someone who understands the bigger picture.