Nokia owns much of the GSM standard, and thus dislikes making CDMA phones. This limits their major models to the AT&T network in the USA.
Nokia also dislikes selling phones trough carriers -- they prefer marketing directly to consumers, not tying their phones to carrier-specific plans.
Together, this means that in the US there is only one carrier where their major model phones work, and that carrier considers Nokia's strategy to be openly hostile to them.
Nokia also doesn't cut deals with carriers to subsidize the cost of their phones like many Android phone manufacturers do. "$520 for a phone? I can almost buy a laptop for that!"
Nokia also dislikes selling phones trough carriers -- they prefer marketing directly to consumers, not tying their phones to carrier-specific plans.
Together, this means that in the US there is only one carrier where their major model phones work, and that carrier considers Nokia's strategy to be openly hostile to them.
So no wonder they don't sell much.