This is getting reposted everywhere even though people in the comments are constantly giving the correct information on why this happened. Just giving you a heads-up so you're not to quick to tie your vote to someone else's willful misunderstanding of the separation of powers.
There were funds appropriated for a portion of the wall in 2019 by Trump with the requirement that construction is completed by the end of 2023. Biden asked congress to reappropriate the funds, as he does not have the power to do so, and congress refused. His hands are mostly tied here from what I understand.
hahahahahahaha "the man in charge of the country and the political party in power have no say! they have to do the incredibly evil thing! the money couldn't just sit there and not get used, that would be a worse sin than putting up barbed wire and machine gun nests"