The Democratic party makes better decisions to keep the country functioning for the most part, and may help the working class more than the opposing party by sometimes increasing welfare, access to healthcare, and civil/human rights, but they are both firmly beholden to the elite in the US that exploit the working class. The dems have had the presidency, but it’s been rare that either party has a large majority control of government, so most progress is stalled by the opposing party.
Like someone else mentioned, if you are from Europe, it helps to think of both of our parties as right-wing parties, or center to center-right and right.