Residents of Alberta voted on Monday to remain part of Canada, rejecting a campaign to try to separate the oil-rich western province from the rest of the country.

The soft separation question of the referendum, about whether to have a definitive referendum on separating from Canada, was overwhelmingly rejected by Albertans.

Questions 1 through 9 of the Alberta referendum focus on a variety of issues, from immigration rules to Senate choices and other concepts the government suggests would improve Alberta’s status in Cana...