Traveling to the US on a B1/B2 visa as a dual citizen

I'm a dual citizen of countries A and B. Citizens of both A and B require a visa to travel to the US. I hold a B1/B2 visa in my A passport and visit the US often for both business and pleasure. My A passport is about to expire soon, while B passport will be valid for a few more years. I'm curious if:

There's a simplified process of obtaining a B1/B2 visa as a citizen of B, given that I already have that visa as a citizen of A. Ideally that process won't require me to resubmit all documents and pay the full visa fee.
It's possible to get admitted into the US with a valid B passport and expired A passport that includes the visa.

Thanks!

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Can B1 B2 visitors travel to USA?

The B1/B2 visa covers a variety of reasons for travel to the United States that includes both business and tourism/non-business purposes. Reasons for travel under a B1/B2 visa include but are not limited to: Conducting business, such as negotiating a contract or attending business meetings.

How many times can you enter the US on a B1 B2 visa in a year?

The B visa is a multiple entry visa, which means you can use it to enter the United States more than once. There is no limit on the number of times you can enter the U.S. on your B visa, as long as you keep the information we discuss below in mind.

How long can visitors stay in the United States with a B1 B2 visa?

The holder of a B-2 visa can stay for a maximum of 180 days per entry (several times consecutively or at a time). These conditions apply to all visits until the visa has expired. After that the person must reapply for the visa at their U.S. consulate.

Do dual citizens need a visa?

Advantages of Dual CitizenshipThey are also allowed to work in either country without needing a work permit or visa and can attend school in either country at the tuition rate offered to citizens (versus the international tuition rate).

Traveling with two passports - I almost got arrested | Jure Sanguinis Italian Dual Citizenship

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