O Democrats held the majority of the seats for many years.
In the decades following the New Deal, Democrats held the majority of the seats in Congress for a significant portion of the time. The New Deal era, which occurred during the 1930s, marked a period of significant legislative reforms and policies implemented by President Franklin D. Roosevelt and the Democratic Party. These reforms aimed to address the challenges of the Great Depression and promote economic recovery and social welfare.
The Democratic Party's dominance during this time translated into a strong presence in Congress, allowing them to pass and implement many of the New Deal policies. The Democrats held the majority in both the House of Representatives and the Senate, which enabled them to push through significant legislation and shape the legislative agenda.
It's important to note that political dynamics can change over time, and there were instances when Republicans gained control or Democrats and Republicans shared control in Congress. However, during the immediate decades following the New Deal, Democrats held a significant influence and often held the majority of seats in Congress.