US Vice President Kamala Harris announced a plan to give Black men more economic opportunities and other chances to thrive as she works to energise a key voting bloc that has Democrats concerned about a lack of enthusiasm.

Harris' plan includes providing forgivable business loans for Black entrepreneurs, creating more apprenticeships and studying sickle cell and other diseases that disproportionately affect African American men.

Harris already has said she supports legalising marijuana and her plan calls for working to ensure that Black men have opportunities to participate as a "national cannabis industry takes shape". She also is calling for better regulating cryptocurrency to protect Black men and others who invest in digital assets.

The vice president's "opportunity agenda for Black men" is meant to invigorate African American males at a moment when there are fears some may sit out the election rather than vote for Harris or her opponent, Republican former President Donald Trump.

The vice president unveiled the plan as she visited Erie, Pennsylvania, where she stopped by LegendErie Records and Coffee House, a Black-owned small business, for a conversation with Black men from the area. Later, she was to hold a campaign rally in the northwest Pennsylvania city.

Her push comes after former President Barack Obama suggested last week that some Black men "aren't feeling the idea of having a woman as president".

The Harris campaign also has been working to increase support among other male voting blocs, including Hispanics, by founding the group Hombres con Harris, Spanish for Men with Harris. The latest policy rollout is notable because it comes with the stated purpose of motivating Black men to vote mere weeks before Election Day.

As her campaign has done with the Hombres group, Harris' team plans to organise gender-specific gatherings.

Those include Black Men Huddle Up events in battleground states featuring African American male celebrities for things like watch parties for NFL and NCAA football games. The campaign says it also plans new testimonial ads in battleground states that feature local Black male voices.

Cedric Richmond, co-chair of the Harris campaign and a former Louisiana congressman who is Black, said Harris wants to build an economy "where Black men are equipped with the tools to thrive: to buy a home, provide for our families, start a business and build wealth".

Black Americans strongly supported Joe Biden when he beat Trump in 2020. Harris advisers say they are less worried about losing large percentages of Black male support to the former president than that some will choose not to turn out at all.

Trump, too, has stepped up efforts to win over Black and Hispanic voters of both genders.

He has held roundtables with Black entrepreneurs in swing states and will sit for a townhall sponsored by Spanish-language Univision this week. He also has sought to openly stoke racial divisions, repeatedly suggesting that immigrants crossing the US-Mexico border illegally are taking jobs from Black and Hispanic Americans.

A recent poll conducted by The Associated Press-NORC Center for Public Affairs Research found about seven in 10 Black voters had a favourable view of Harris and preferred her leadership to that of Trump on major policy issues including the economy, health care, abortion, immigration and the war between Israel and Hamas.

There was little difference in support for Harris between Black men and Black women.