It depends on if your use of BLM means "lives of those of African-decent matter" or "the Black Lives Matter movement/group".

Personally i would expect the former to have more widespread support in America. The latter stands for many things that could be more controversial in the states. A DuckDuckGo for "blm demands"[0] returns the following NPR piece[1] from DC-based interviews. It lists BLM demands as:

  - Defund Police
  - No New Jails
  - Decriminalize Sex Work
  - Police-Free Schools
  - Drop Charges Against Protesters
  - End Cash Bail In Maryland
  - Ban Stop And Frisk

0: https://duckduckgo.com/?q=blm+demands

1: https://www.npr.org/local/305/2020/06/09/872859084/here-s-wh...