OTTAWA — Oh no. Now they’ll spoil everything.

The grumbling and dismay began on social media even before Presidents Obama and Raúl Castro formally announced the Cuban-American reconciliation on Wednesday.

Canada never imposed an embargo on Cuba the way the United States did, and Canadians have been allowed to travel and do business there with few if any restrictions.

Now, many Canadians were lamenting, the thaw between Havana and Washington meant that Cuba might soon cease to be that rarest of oases: an affordable warm-weather vacationland with hardly an American in sight.