Question: When did the party who gained control of congress in the midterm elections in 1946 take control of the determiner of rules of the US House and US Senate?

Knowledge 1: 1946 United States House of Representatives elections
Truman was Vice President under President Franklin D. Roosevelt and was thrust into the presidency following Roosevelt's death. Truman did not garner the same support as the deceased president. Democrats had controlled Congress since 1931, for 16 years, and Roosevelt had been elected to a record four terms in office. The 1946 election resulted in Republicans picking up 55 seats to win majority control. Joseph William Martin, Jr., Republican of Massachusetts, became Speaker of the House, exchanging places with Sam Rayburn, Democrat of Texas, who became the new Minority Leader. The Democratic defeat was the largest since they were trounced in the 1928 pro-Republican wave that brought Herbert Hoover to power. [SEP] Knowledge 2: Standing Rules of the United States Senate
The Standing Rules of the Senate are the parliamentary procedures adopted by the United States Senate that govern its procedure. The Senate's power to establish rules derives from Article One, Section 5 of the United States Constitution: ``Each House may determine the rules of its proceedings... '' [SEP] Knowledge 3: 110th United States Congress
The Democratic Party controlled a majority in both chambers for the first time since the end of the 103rd Congress in 1995. Although the Democrats held fewer than 50 Senate seats, they had an operational majority because the two independent senators caucused with the Democrats for organizational purposes. No Democratic - held seats had fallen to the Republican Party in the 2006 elections. Democrat Nancy Pelosi became the first woman Speaker of the House. The House also received the first Muslim (Keith Ellison) and Buddhist (Hank Johnson and Mazie Hirono) members of Congress.
Knowledge 1: Standing Rules of the United States Senate
The Standing Rules of the Senate are the parliamentary procedures adopted by the United States Senate that govern its procedure. The Senate's power to establish rules derives from Article One, Section 5 of the United States Constitution: ``Each House may determine the rules of its proceedings... '' [SEP] Knowledge 2: 115th United States Congress
The One Hundred Fifteenth United States Congress is the current meeting of the legislative branch of the United States federal government, composed of the Senate and the House of Representatives. It meets in Washington, D.C. from January 3, 2017, to January 3, 2019, during the final weeks of the Obama presidency and the first two years of Donald Trump's presidency. The November 2016 elections maintained Republican control of both the House and Senate. [SEP] Knowledge 3: 1946 United States House of Representatives elections
Truman was Vice President under President Franklin D. Roosevelt and was thrust into the presidency following Roosevelt's death. Truman did not garner the same support as the deceased president. Democrats had controlled Congress since 1931, for 16 years, and Roosevelt had been elected to a record four terms in office. The 1946 election resulted in Republicans picking up 55 seats to win majority control. Joseph William Martin, Jr., Republican of Massachusetts, became Speaker of the House, exchanging places with Sam Rayburn, Democrat of Texas, who became the new Minority Leader. The Democratic defeat was the largest since they were trounced in the 1928 pro-Republican wave that brought Herbert Hoover to power.
Knowledge 1: 1946 United States House of Representatives elections
Truman was Vice President under President Franklin D. Roosevelt and was thrust into the presidency following Roosevelt's death. Truman did not garner the same support as the deceased president. Democrats had controlled Congress since 1931, for 16 years, and Roosevelt had been elected to a record four terms in office. The 1946 election resulted in Republicans picking up 55 seats to win majority control. Joseph William Martin, Jr., Republican of Massachusetts, became Speaker of the House, exchanging places with Sam Rayburn, Democrat of Texas, who became the new Minority Leader. The Democratic defeat was the largest since they were trounced in the 1928 pro-Republican wave that brought Herbert Hoover to power. [SEP] Knowledge 2: Standing Rules of the United States Senate
The Standing Rules of the Senate are the parliamentary procedures adopted by the United States Senate that govern its procedure. The Senate's power to establish rules derives from Article One, Section 5 of the United States Constitution: ``Each House may determine the rules of its proceedings... '' [SEP] Knowledge 3: 115th United States Congress
The One Hundred Fifteenth United States Congress is the current meeting of the legislative branch of the United States federal government, composed of the Senate and the House of Representatives. It meets in Washington, D.C. from January 3, 2017, to January 3, 2019, during the final weeks of the Obama presidency and the first two years of Donald Trump's presidency. The November 2016 elections maintained Republican control of both the House and Senate.

Answer: January 2015