Hi!
The correct answer is:
A. Gutenberg's Printing Press!
Hope I helped!
The federalist paper is to persuade the states to create a new constitution where a federal government is established. After the American Revolution, the government have less power compared to the state government. To further unite the country, Hamilton and Madison (and others too) wrote the federalist paper to persuade Americans that a strong centralized government is needed. With a federal government, nationality is created. States agreed, but they want some states/human rights included in the constitution. Thus the Bill of Rights were created.
The radio talks that U.S. President Franklin D. Roosevelt were a very famous radio talk show. They were called Fireside Chats and they were used to talk to the American population about many things he was doing in order to aid them through the Great Depression.
