What is the approximate length of the united states border with canada?

no ! i'm watching you

Which choice describes some of the difficulties john adams faced as presiden

The rise of advertising in the 1920s. i am good with seeing how advertisements shape the roaring twenties and how it developed a new way of life through modern days. but i am not sure what the details of advertising in the 1920s were. if possible can you send me links (preferrably credential links) to sources that maybe show like the first company to start advertising through the radio, how advertising benefits (statistics graphs), etc.

What happened to hudsons voyage east across the top of russia ?