Mayor Bill de Blasio blamed the federal government for nearly all the city’s problems Wednesday.

We’re in the “dead-ball era of federal government,” de Blasio told a Midtown summit on urban growth hosted by The Atlantic magazine.

“There’s not a federal policy to address income inequality. There’s not a federal early-child- education policy. There’s not a federal affordable-housing policy,” he added.

“People need to understand — even on our best day, if you’re in a city, a state, there’s only so much you can do,” he said, adding that “they can’t do what the federal government can do.”

But an organizer from the Bronx, who gave her name as Kat, said de Blasio deserved much of the blame.

She denounced the city’s affordable-housing program as “planned displacement,” claiming it was geared to people making an average of $46,000 a year, which excluded many Bronx residents.

The mayor contested “the construct of the question” and said that even more gentrification would occur if the city didn’t pursue affordable housing.