The question is a bit ambiguous. It's likely asking about the country that controlled territory north of the U.S. boundary, but also south and west of it. This implies the territory is adjacent to the U.S. on its northern border, but also extends west and south of the border.

This description fits Canada, which is located north of the U.S. boundary and extends west and south along the border, covering most of the northern portion of North America.

It's important to note that the question could be interpreted in other ways, so providing more context could lead to a more precise answer.