Prince Edward Island’s entry into Confederation happened later because its decision was tied to specific terms and promises, not just a blanket move with the rest of the colonies. When Confederation began in 1867, PEI did not join then; the terms offered at that time didn’t satisfy island interests and there was strong local opposition. It wasn’t until 1873, after Ottawa pledged to address PEI’s financial needs and to connect the island to the rest of Canada with a funded Intercolonial Railway, that PEI agreed to join. PEI became a province on July 1, 1873. So the correct year is 1873.

In 1982, Canada brought its constitution home and added a charter of rights into it. This move, known as patriation, transferred the power to amend and govern the highest law from Britain to Canada, establishing a Canadian-based process for constitutional changes. Along with patriation, the Constitution Act, 1982 enshrined the Charter of Rights and Freedoms, which guarantees fundamental rights and freedoms and sets out how they are protected and applied. This combination—ending Britain's direct role in amending the Canadian constitution and placing a formal rights charter at the heart of the constitution—represents the major constitutional shift of 1982. Meech Lake was an later, incomplete 1980s attempt to modify the system; the Canada Act 1982 refers to the British statute that enabled patriation but is not by itself the full change, since the charter and the specific Canadian amending formulas are part of the same milestone.

Two new provinces were created from the Northwest Territories in 1905: Saskatchewan and Alberta. The question asks which province joined Confederation that year alongside Saskatchewan, and it’s Alberta. This happened through the Alberta Act and the Saskatchewan Act, giving both provinces official status in 1905. Manitoba, Nova Scotia, and British Columbia had already become provinces earlier (Manitoba in 1870, Nova Scotia in 1867, British Columbia in 1871).

Responsible government is the system where the executive—the Prime Minister and the cabinet—must have the support of the elected legislature to govern. In this setup, the cabinet is drawn from elected representatives and can stay in office only as long as it has the confidence of the majority in the House of Commons. If the government loses a confidence vote or fails to pass crucial legislation like the budget, it is expected to resign or seek dissolution to trigger an election. This arrangement ensures the executive is directly accountable to, and dependent on, the elected representatives and, through them, the people. The other concepts describe broader structures (a ceremonial monarch within a constitutional framework, the idea that Parliament has ultimate legal authority, or an absolute monarch), but they do not capture the requirement that the executive must maintain legislative confidence.

At Confederation, Canada set up a two-chamber Parliament. The upper chamber is the Senate. It was created to provide regional representation and to review legislation from the elected House of Commons, offering a second layer of consideration and balance. Senators are appointed to represent provinces and regions, rather than serve as direct elected representatives. The other option, the House of Commons, is the lower chamber made up of elected Members of Parliament. The Lords is the British Parliament’s upper house, not part of Canada, and the Council of Provinces isn’t a formal parliamentary chamber in Canada.