"Elected at the beginning of each Congress by members of their respective party conferences to represent them on the Senate floor, the majority and minority leaders serve as spokesmen for their parties' positions on the issues. The majority leader has also come to speak for the Senate as an institution. Working with the committee chairs and ranking members, the majority leader schedules business on the floor by calling bills from the calendar and keeps members of his party advised about the daily legislative program. In consultation with the minority leader, the majority leader fashions unanimous consent agreements by which the Senate limits the amount of time for debate and divides that time between the parties. When time limits cannot be agreed on, the majority leader might file for cloture to shut off debate. Occupying the front desks on the center aisle, the two leaders coordinate party strategy and try to keep their parties united on roll-call votes." (From "Majority and Minority Leaders and Party Whip," http://www.senate.gov/artandhistory/history/common/briefing/Majority_Minority_Leaders.htm)
Representatives who belong to the majority party in the House of Representatives can elect one of their group as Speaker.
The person or group that elects the majority leader depends on the society. The people in the US elect their leader for example because they are in a democracy.
The majority leader in the House of Representatives is appointed by the Speaker. This speaker is tasked with the duty of appointing the leadership of the house.
Th members of the minority party as of the most recent elections.
Congress elects the leader.
The governor
the majority party the majority party
caucus
caucus
The majority party in each house chooses the heads of committees by secret vote in a party caucus
The party with the majority of members in the House since the members of the house chooses the Speaker by a vote. In theory a Speaker could be chosen from the minority party but it has never happened.
House and Senate leaders are chosen by their party caucuses (so the party that holds the majority of seats chooses the majority leader and the Speaker of the House, while the party in the minority chooses the minority leader).
I assume you're referring to the Majority Leader and Minority Leader. There are two because there are two major parties; each party chooses its own leader, with the party that holds the majority of seats selecting the Majority Leader.
In the Arizona Legislature, the majority party and the minority party each elect officers to assist with the conduct of their business. The members of each bloc or party elect a majority leader or a minority leader to serve as spokesmen and to privide general directions for their repsective parties.
majority party
The Speaker of the House is elected by the members of the House of Representatives. Before the vote each party chooses their candidate. The majority party's candidate will then win the election (assuming his or her party's representatives vote according to the party's decision).
The Senate elects the pro tempore from among its membership. Not surprisingly, he is always a member of the majority party. It is has become customary to elect the party member who has the most seniority in the Senate.
The Republicans are the majority party in the House of Representatives. The Democrats are the majority party in the Senate.