Suggest a reason why we do not know the exact location of vinland

What alliance later grew into the political, populist party, also known as the people’s party?

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.

Did the both the us and ussr have atomic weapons after 1949