It’s partly (1) due to the structure (or rather, flaws) of the US constitution, (2) a ridiculous senate rule, and (3) gerrymandering as others have mentioned.

It’s partly (1) due to the structure (or rather, flaws) of the US constitution, (2) a ridiculous senate rule, and (3) gerrymandering as others have mentioned. On (1): needing the approval of the senate, house, and president makes it very hard to pass laws. On (2): the senate rule requiring 60% approval has already been repealed for appointments and for budgetary legislation, but it really needs to thrown out. The first two years of Biden’s presidency were mostly lost to obstructionism because of this rule. On (3): this will most likely be banned if democrats get a trifecta federal control, and repeal (2), since gerrymandering primarily just benefits republicans.