The Great Depression Causes And Effects<span>. ... Most people think the </span>Great Depression<span> started in October 1929, with the famous Black Tuesday stock market crash, but economists and historians point to an economic downturn which took hold in early 1929 </span>
Answer:
The invention of the printing press by Johannes Gutenberg.
Explanation:
The invention of the printing press by Johannes Gutenberg allowed new ideas to spread more quickly around Europe. The discovery of America by Columbus meant that new foods and medicines were brought back from the New World.