More than 30 million Americans trace their roots back to Mexico - it's the fastest growing demographic in the US.

While the focus of the political debate is on the recent arrivals - especially those who entered illegally - many immigrants have been in the country for generations. Of course, some states in the south west, including Arizona, were originally part of Mexico before they joined the Union.

It is therefore hard to define the Mexican-American experience. People's attitudes, beliefs and even their choice of cuisine is influenced by when they arrived in the US and how connected they stay to their Mexican traditions.

BBC Pop Up spent January in Tucson, not far from the border, where 42% of the population is Hispanic. Benjamin Zand asked dozens of people to explainand Sanders, who have advocated more progressive platforms.

The Times noted that while more moderate voters preferred Biden in the survey released Friday, the more progressive respondents were almost evenly divided between Warren and Sanders.

The survey was also affected by race and age. Older Democratic voters of color and those without college degrees supported Biden. Younger Democrats of all racial backgrounds preferred Warren and Sanders. Those with college degrees also preferred Warren, according to the poll.

Among black voters in the six states, Biden remained the overwhelming favorite with 42 percent support, compared to 13 percent for Warren and 10 percent for Sanders.

The Times–Siena poll surveyed 1,568 Democratic primary voters in the six states from Oct. 13 to 26. It has a margin of sampling error of plus or minus