With an American visa, can I go directly to Mexico without a Mexican visa?

With an American visa, you can go directly to Mexico without applying for a Mexican visa. China citizens with valid US visas (valid for multiple times) can stay in Mexico 180 days. Whether you have passed through the United States or not, even if you fly directly from China to Mexico without passing through a third country, you can enter Mexico as long as you have a valid American visa. When you enter Mexico, you will put a Mexican entry stamp on the American visa page. Of course, there are exceptions. If a citizen of China holds a valid US visa for single entry within one year, he/she must first enter Mexico, even if he/she transits through the United States, because you will enter the United States once during your connecting flight, and then you cannot return to the United States.

China citizens can travel to the United States and Mexico on tourist visas. Whether you have entered Mexico through the United States or not, even if you fly directly from China to Mexico without going through a third country, you can enter Mexico as long as you have a valid visa from the United States. Note that you must have a valid American visa when you arrive in Mexico before you can enter the country without a visa. If China citizens have a visa valid for six months and can enter the United States for multiple times, they can enter Mexico without a visa within the validity period of the visa.

For another example, a China citizen goes to Mexico with a US visa valid for three months and valid for one entry. When he came to Mexico through the United States, his first American entry visa had been used, which was invalid. Before being allowed to enter Mexico, he must complete his Mexican visa in advance. If he goes to Mexico first and then to the United States, he can enter Mexico without a visa. With a US visa, you can stay in Mexico for 180 days, Panama for 30 days, Bermuda for 180 days and South Korea for 30 days.

References:

Baidu Encyclopedia-American Visa