You said specifically dozens, therefore there must have been dozens of democratic presidents who had a full democratic Congress.
Not necessarily, it could be 10 times over 2 years.
Regardless, I’ve listed at least 12 years that democrats had a president and majorities in senate and congress - yet, not once did they enshrine what you argue is a human right. Either they didn’t think it’s a human right, they didn’t want to codify it, or it’s just not high on their priority list. They’ve had plenty of opportunities, you only got the dems to blame.