On November 3, about 210 million registered voters will decide how much power Donald Trump has for the rest of his US presidency.

Trump is not on the ballot, but control of the United States Congress is. Made up of the House of Representatives and the Senate, Congress writes the country’s laws and controls federal spending.

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In this visual explainer, Al Jazeera breaks down how the elections work, which races matter and what the results could mean for either party.

What happens in the midterm elections?

Held halfway through a US president’s four-year term, midterm elections decide the makeup of Congress.

All 435 seats…