Which branch of central government makes/enact/ passes laws

In approximately 1500, most american indians in the northeast and the southeast lived and made decisions in

Identify the reason each country wanted to go to war in the year before and during world war 1

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.