From CTV Winnipeg:
The book, along with TinTin in the Congo, had already been pulled out of the library’s main circulating collection before 2006 and placed into a research collection of children’s historic books due to a concern at that time.
In 2013, this research collection was disbanded because of a changing library mandate, lack of use, and other libraries, like those in Universities, are better suited for research collections.
But in the last year or so, the city says TinTin in America was added back into the library’s collection as part of a re-order process. TinTin in the Congo was not added back in that same process.
The city says it will review its reordering process as a result, and that it has received no complaints since the title was added back.
From the CBC:
The American Library Association tracks frequently challenged books in the states, while Canada's Book and Periodical Council does the same through its project, Freedom to Read week.
It takes extraordinary circumstances for those two organizations to be onside with a book ban. The text must be illegal, like one containing child pornography or one that attempts to incite hatred against a group of people.
Related: More on Tintin in the Congo.