The important part for answering this question is: The tournament will be jointly hosted by 16 cities in three North American countries; 60 matches, including the quarterfinals, semi-finals, and the final, will be hosted by the United States while neighboring Canada and Mexico will each host 10 matches.
This justifies what answer for what question? Q & A:
Passage: The 2026 FIFA World Cup (Spanish: Copa mundial de la FIFA de 2026; French: Coupe du monde de la FIFA de 2026) will be the 23rd FIFA World Cup, the quadrennial international men's football championship contested by the national teams of the member associations of FIFA. The tournament will be jointly hosted by 16 cities in three North American countries; 60 matches, including the quarterfinals, semi-finals, and the final, will be hosted by the United States while neighboring Canada and Mexico will each host 10 matches. The tournament will be the first hosted by three nations.

Question: Based on this passage, where is going to be the next world cup in 2026?
the United States