I was referring specifically to Senate, however it's a long messy history, let me go on GovTrack.us and see if I can find the senate records to explain what I mean

Edit: there it is,

✓On the opening day of the One Hundred Seventeenth Congress, the U.S. Senate was comprised of 51 Republicans, 46 Democrats, 2 Independents (who caucused with the Democrats), and 1 vacancy. No candidate received a majority of votes in the general election for Georgia's class 2 seat or in the special election for Georgia's class 3 seat. Runoff elections for both of the state's Senate seats were scheduled for January 5, 2021. Democratic candidates won both elections. Following the inauguration of Vice President Kamala D. Harris on January 20, 2021, the Senate had a Democratic majority, comprised of 50 Republicans, 48 Democrats, and 2 Independents (who caucus with the Democrats). The Vice President is able to cast tie-breaking votes in the Senate. See United States Senate, "Party Division," https://www.senate.gov/history/partydiv.htm. Office of the Historian: history@mail.house.gov Office of Art & Archives, Office of the Clerk: art@mail.house.gov, archives@mail.house.gov

The below information is a tie which effectively allowed for stonewalling. Yes if all Democratic senators, 2 independents and the vice president voted together they could push things through. However the fact of the matter is they don't tow the party line like Republicans and vote more independently. Perhaps a party failure but I see that as a tenant of a functioning democracy.

You could make the argument against an enemy willing to use those tactics not using them Is a failure to the people but I'd argue the smarter thing as individuals would be to blame Republicans and vote them out of positions of power.

And before that the last time they had a majority was 2009 to 2011