Answer:
Global Spread: Gold Standard
The stock market crash of October 1929 led directly to the Great Depression in Europe. When stocks plummeted on the New York Stock Exchange, the world noticed immediately. ... The gold standard was the primary transmission mechanism of the Great Depression
Because the french and the british were fighting over land from the Native Americans so they wernt very happy about that!
<span>easier to write
With the introduction of the zero we can now write very big or very small number with no need to introduce new symbols.
For example the Egyptians had symbols for 100, 1000, 10,000 etc.
we only need 2 symbols!!!</span>
